Fix gettid warnings on FreeBSD
[Split off from D59451 to get this fix in separately]
While building the 8.0 releases on FreeBSD, I encountered the following
warnings in openmp quite a few times:
In file included from projects/openmp/runtime/src/kmp_settings.cpp:27: projects/openmp/runtime/src/kmp_wrapper_getpid.h:35:2: warning: #warning is a language extension [-Wpedantic] #warning No gettid found, use getpid instead ^ projects/openmp/runtime/src/kmp_wrapper_getpid.h:35:2: warning: No gettid found, use getpid instead [-W#warnings] 2 warnings generated.
I added a gettid wrapper that uses FreeBSD's pthread_getthreadid_np(3)
function for this.
Reviewers: emaste, jlpeyton, krytarowski, mgorny, protze.joachim
Reviewed By: jlpeyton
Subscribers: jfb, jdoerfert, openmp-commits
Differential Revision: https://reviews.llvm.org/D59735