[PATCH] Add missing atomic libcall support.

[James Y Knight]

Support for emitting libcalls for __atomic_fetch_nand and
__atomic_{add,sub,and,or,xor,nand}_fetch was missing; add it, and some
test cases.

http://reviews.llvm.org/D10847

Files:
  docs/LanguageExtensions.rst
  lib/CodeGen/CGAtomic.cpp
  test/CodeGen/atomic-ops-libcall.c

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