[Threading] Fix C11 once implementation to not rely on lock recursion. #70761
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The implementation mistakenly locked and unlocked the mutex in `helper.once_wait()`, which is only ever called from inside a region where the mutex is already locked. rdar://119739594
mikeash
approved these changes
Jan 8, 2024
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The implementation mistakenly locked and unlocked the mutex in
helper.once_wait(), which is only ever called from inside a region where the mutex is already locked.rdar://119739594