[FIX][Relax] Guard unknown tensor shapes in VMShapeLower - #20345
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Only apply the static-shape shortcut when a ShapeExpr exists. Keep unknown tensor shapes on the existing runtime-check path and cover bundled symbolic parameters.
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Fixes #20335.
The static-shape shortcut dereferenced a missing
ShapeExprfor unknown-shape tensor fields. Guard that shortcut and keep the existing runtime checks. Add coverage for unknown-shape tuple parameters and the reportedBundleModelParams → VMShapeLowersequence.Validation on Linux CPU / LLVM 16, based on
cc0f9f07and its pinned TVM FFI:-11).InternalErrorat VM codegen instead of crashing; this does not add Prim-parameter execution support.