[OpenMP] Exchange code in asm file for inline assembly

This change replaces some of the assembly functions in z_Linux_asm.S
for inline asm in kmp.h. This allows better interaction with compiler
tools and sanitizers.

Differential Revision: https://reviews.llvm.org/D60423


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@358438 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed