Cache generated method compilation

[KRRT7]

Summary

Cache compiled generated method scripts by script shape to avoid recompiling identical methods for repeated attrs class definitions.

• Keep the cache bounded at 128 entries.
• Preserve class-specific traceback and debugger filenames by rewriting cached code objects recursively.
• Compile cache misses directly with their real filename, avoiding a regression for unique class shapes.

[codspeed-hq]

Merging this PR will improve performance by ×2.9

⚡ 4 improved benchmarks
✅ 13 untouched benchmarks
⏩ 2 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	test_create_cached_property_class	6 s	1.8 s	×3.4
⚡	Simulation	test_create_frozen_class	4.5 s	1.5 s	×2.9
⚡	Simulation	test_create_simple_class_make_class	3.5 s	1.2 s	×2.9
⚡	Simulation	test_create_simple_class	3.7 s	1.4 s	×2.6

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing KRRT7:perf/cache-generated-method-compilation (5c16645) with main (6851ab5)}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[hynek]

I think this is an artificial optimization. Unless I'm missing something, it only works when someone keep creating (not instantiating) the same class over and over again. We do that in benchmarks, but that's not something regular codes does. On the flip side, this creates a cache that every class pays for.