[xnn update prep] Update ET Pthreadpool third-party to google

[mcr229]

No description provided.

[mcr229]

Stack from ghstack (oldest at bottom):

• -> [xnn update prep] Update ET Pthreadpool third-party to google #11507
• [xnn update prep] deprecate sdpa #11506

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11507

• 📄 Preview Python docs built from this PR

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❌ 3 New Failures, 1 Unrelated Failure

As of commit e54541a with merge base 1af16cd ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  RuntimeError: Command docker exec -t 2b89152259420359d91d346cc202624f05a1122c251c5f2dc647f0656ca10fe4 /exec failed with exit code 127
• pull / test-moshi-linux / linux-job (gh)
  test_exported_decoder_xnnpack
• trunk / test-llama-runner-mac (fp32, coreml) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-models-linux (mv2, portable, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[digantdesai]

I guess a drop in replacement?