[compiler-rt] [sanitizer] Fix asserts in asan and tsan in pthread interceptors. (PR #75394)

[via llvm-commits]

goussepi wrote:

Thanks @vitalybuka @dvyukov  for the comments.
Yes, I agree no need to check for invalid pthread_detach calls’ return value, I have removed it from the test.
Regarding the pthread join apis, what about not asserting unless running Tsan (cf test update) ?
Many thanks!
Pierre


https://github.com/llvm/llvm-project/pull/75394