[Bug 214902] head -r309179 buildworld on powerpc64 via clang 3.9.0: llvm::sys::CompareAndSwap and llvm::sys::MemoryFence undefined so build stops

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214902

--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Tue Dec  6 20:44:40 UTC 2016
New revision: 309656
URL: https://svnweb.freebsd.org/changeset/base/309656

Log:
  During the bootstrap phase, when building the minimal llvm library on
  PowerPC, add lib/Support/Atomic.cpp.  This is needed because upstream
  llvm revision r271821 disabled the use of std::call_once, which causes
  some fallback functions from Atomic.cpp to be used instead.

  Reported by:  Mark Millard
  PR:           214902
  X-MFC-With:   309124

Changes:
  head/lib/clang/libllvmminimal/Makefile

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