[LSan] Mark create_thread_leak.cpp as UNSUPPORTED: darwin.

[hnrklssn]

This test failed in https://green.lab.llvm.org/green/job/clang-stage1-RA-release-17.x/63/ but not in https://green.lab.llvm.org/green/job/clang-stage1-RA-release-17.x/64/, which uses the same checkout of the LLVM repo. The only difference is llvm/llvm-zorg@0344f45 which is an llvm-zorg commit and doesn’t seem related. Cherry-picking this to prevent flaky test failures on the release branch:

It started to fail in a flaky manner a few days ago on GreenDragon buildbots
(i.e. x86_64-darwin). I didn't track down the root cause but LSan isn't actually
supported on darwin anyway, so UNSUPPORTED seems appropriate.

Prior art: 3ff080b5.

(cherry picked from commit 0a3519d5a27b9400250b5f6656b50148021e7496)

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[tru]

This was closed because the release repo still contains the workflow that closes PR's automatically. Generally we still use the issue comment cherry-pick way to open these PRs for the release branch, but it's fine and I have reopened it.

[tru]

Ah on other thoughts, it's probably better you use the cherry-pick comment flow, because this will be closed again if you push any updates.

[hnrklssn]

Ah, I see! I wasn't aware of the magic comments. I'll give them a try.