llvm-project

e1aef9e2 - [libc++] Fix missing availability check for visionOS in apple_availability.h (#187015)

[libc++] Fix missing availability check for visionOS in apple_availability.h (#187015) Without this, we were assuming that __ulock was unavailable on visionOS and falling back to the manual implementation, when in reality we can always rely on the existence of ulock. Fixes #186467