CI: cache SwiftShader prebuilt to skip per-run from-source build (#20203)

[ghost]

Summary:

Try a pinned-rev SwiftShader prebuilt from gha-artifacts before building from source (mirrors the torch-wheel download-or-build in .ci/scripts/utils.sh); on a cache miss, fall back to the existing from-source build. The key embeds SWIFTSHADER_REV, so a rev bump auto-invalidates (re-seed S3 once per bump). Follow-up to the Dawn CI diff, addressing review feedback to cache the build.

Reviewed By: SS-JIA

Differential Revision: D108185797

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20203

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 236 Cancelled Jobs, 3 Unrelated Failures, 36 Unclassified Failures

As of commit 69653b8 with merge base 005ae03 ():

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

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• trunk / test-arm-backend-ethos-u (test_run_ethos_u85) / linux-job (gh)
• trunk / test-arm-backend-ethos-u (test_smaller_stories_llama_tosa) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend-vkml (test_ootb_tests_vgf) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend-vkml (test_pytest_models_vkml) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend-vkml (test_pytest_ops_vkml) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend-vkml (test_smaller_stories_llama_vkml) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend-zephyr (zephyr/samples/hello-executorch/README.md, cortex-m55) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend-zephyr (zephyr/samples/hello-executorch/README.md, ethos-u55) / linux-job (gh)
• trunk / test-arm-backend-zephyr (zephyr/samples/hello-executorch/README.md, ethos-u85) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend-zephyr (zephyr/samples/mv2-ethosu/README.md, ethos-u55) / linux-job (gh)
• trunk / test-arm-backend-zephyr (zephyr/samples/mv2-ethosu/README.md, ethos-u85) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-cortex-m-e2e / run (mv2, cortex-m0plus) / mv2-cortex-m0plus (gh)
  ##[error]The operation was canceled.
• trunk / test-cortex-m-e2e / run (mv2, cortex-m55) / mv2-cortex-m55 (gh)
• trunk / test-cortex-m-e2e / run (mv2, cortex-m7) / mv2-cortex-m7 (gh)
  ##[error]The operation was canceled.
• trunk / test-cortex-m-e2e / run (mv3, cortex-m0plus) / mv3-cortex-m0plus (gh)
  ##[error]The operation was canceled.
• trunk / test-cortex-m-e2e / run (mv3, cortex-m55) / mv3-cortex-m55 (gh)
  ##[error]The operation was canceled.
• trunk / test-cortex-m-e2e / run (mv3, cortex-m7) / mv3-cortex-m7 (gh)
• trunk / test-cortex-m-ops / run (cortex-m0plus) / cortex-m-ops-cortex-m0plus (gh)
  ##[error]The operation was canceled.
• trunk / test-cortex-m-ops / run (cortex-m7) / cortex-m-ops-cortex-m7 (gh)
  ##[error]The operation was canceled.
• trunk / test-demo-backend-delegation (buck2) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-demo-backend-delegation (cmake) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-llama-runner-linux (bf16, custom, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / linux-job (gh)
• trunk / test-llama-runner-linux (bf16, portable, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-llama-runner-linux (bf16, portable, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / linux-job (gh)
• trunk / test-llama-runner-linux (fp32, portable, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh)
• trunk / test-llama-runner-linux (fp32, portable, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-llama-runner-linux (fp32, xnnpack+custom, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-llama-runner-linux (fp32, xnnpack+custom, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11... / linux-job (gh)
• trunk / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (add_mul, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (add_mul, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (add, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (add, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (emformer_join, portable, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (emformer_join, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (emformer_transcribe, portable, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (emformer_transcribe, xnnpack-quantization-delegation, linux.arm64.2xla... / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (ic3, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (ic3, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (ic4, portable, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (ic4, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (linear, portable, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (linear, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (llama3_2_vision_encoder, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (lstm, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mobilebert, portable, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (mobilebert, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mul, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mv2, portable, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (mv2, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (mv3, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mv3, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (phi_4_mini, portable, linux.arm64.m7g.4xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (qwen2_5_1_5b, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (resnet18, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (resnet18, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (resnet50, portable, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (resnet50, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (softmax, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (vit, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (vit, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
• trunk / test-models-linux-aarch64 (w2l, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (w2l, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-model (fp32, conv_former) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-model (fp32, dl3) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-model (fp32, ic3) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-model (fp32, ic4) / linux-job (gh)
• trunk / test-qnn-model (fp32, mb) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-model (fp32, mv2) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-model (fp32, mv3) / linux-job (gh)
• trunk / test-qnn-model (fp32, vit) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-model (fp32, w2l) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, albert) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, bert) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, cvt) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, distilbert) / linux-job (gh)
• trunk / test-qnn-optimum-model (fp32, dit) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, efficientnet) / linux-job (gh)
• trunk / test-qnn-optimum-model (fp32, focalnet) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, mobilevit_v1) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, mobilevit_v2) / linux-job (gh)
• trunk / test-qnn-optimum-model (fp32, pvt) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, roberta) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-qnn-optimum-model (fp32, swin) / linux-job (gh)
• trunk / test-torchao-huggingface-checkpoints (lfm2_5_1_2b, linux.2xlarge, executorch-ubuntu-22.04-clang12... / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-torchao-huggingface-checkpoints (lfm2_5_1_2b, linux.arm64.2xlarge, executorch-ubuntu-22.04-g... / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-torchao-huggingface-checkpoints (phi_4_mini, linux.2xlarge, executorch-ubuntu-22.04-clang12,... / linux-job (gh)
• trunk / test-torchao-huggingface-checkpoints (phi_4_mini, linux.arm64.2xlarge, executorch-ubuntu-22.04-gc... / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-torchao-huggingface-checkpoints (qwen3_4b, linux.2xlarge, executorch-ubuntu-22.04-clang12, x... / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-torchao-huggingface-checkpoints (qwen3_4b, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc1... / linux-job (gh)
• trunk / unittest-release / linux / linux-job (gh)
• trunk / unittest-release / macos / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / unittest-release / windows / windows-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Build Aarch64 Linux Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu-aarch64 (gh) (detected as infra flaky with no log or failing log classifier)
• Build macOS Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh) (detected as infra flaky with no log or failing log classifier)
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh) (detected as infra flaky with no log or failing log classifier)

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