[llvm] Fix thread handle leak on Windows (PR #156854)

[Alexandre Ganea via llvm-commits]

=?utf-8?q?Łukasz?= Mielicki <lukasz.mielicki at intel.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/156854 at github.com>


https://github.com/aganea auto_merge_disabled https://github.com/llvm/llvm-project/pull/156854