Xnn weight cache

[lucylq]

Summary

Test plan

ci

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17762

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❌ 3 New Failures

As of commit f397e11 with merge base 19de115 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner (gh)
  >>> Lint for backends/xnnpack/runtime/XNNWeightsCache.cpp:
• Test CUDA Builds / check-all-cuda-builds (gh)
  Process completed with exit code 1.
• Test CUDA Builds / test-executorch-cuda-build-12.8 / linux-job (gh)
  RuntimeError: Command docker exec -t befa60768046ace1c64b557b56dc84ea61b3b84dd2771dd7f02dbe4149d076fb /exec failed with exit code 1

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