[Bug 248864] LLVM: Enable OpenMP on aarch64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248864

--- Comment #1 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: dim
Date: Mon Aug 24 20:37:19 UTC 2020
New revision: 364732
URL: https://svnweb.freebsd.org/changeset/base/364732

Log:
  Merge commit cde8f4c16 from llvm git (by me):

    Move special va_list handling to kmp_os.h

    Instead of copying and pasting the same #ifdef expressions in
    multiple places, define a type and a pair of macros in kmp_os.h, to
    handle whether va_list is pointer-like or not:

    * kmp_va_list is the type to use for __kmp_fork_call()
    * kmp_va_deref() dereferences a va_list, if necessary
    * kmp_va_addr_of() takes the address of a va_list, if necessary

    Also add FreeBSD to the list of OSes that has a non pointer-like
    va_list. This can now be easily extended to other OSes too.

    Reviewed By: AndreyChurbanov

    Differential Revision: https://reviews.llvm.org/D86397

  This should enable building of LLVM's OpenMP on AArch64. Addition to
  share/mk will follow in a subsequent commit.

  PR:           248864
  MFC after:    2 weeks

Changes:
  head/contrib/llvm-project/openmp/runtime/src/kmp.h
  head/contrib/llvm-project/openmp/runtime/src/kmp_csupport.cpp
  head/contrib/llvm-project/openmp/runtime/src/kmp_gsupport.cpp
  head/contrib/llvm-project/openmp/runtime/src/kmp_os.h
  head/contrib/llvm-project/openmp/runtime/src/kmp_runtime.cpp

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