[PATCH] Add support for part-word atomics for PPC

[Nemanja Ivanovic]

It would appear that in applying the patch to my repository from an anonymous one has somehow lost some of my changes. Moved the position of the stwcx definition and added the check prefix for all the Power7 and up checks in the IR test case.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8090

Files:
  lib/Target/PowerPC/PPC.td
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Target/PowerPC/PPCInstr64Bit.td
  lib/Target/PowerPC/PPCInstrInfo.td
  lib/Target/PowerPC/PPCSubtarget.h
  test/CodeGen/PowerPC/atomic-2.ll
  test/MC/Disassembler/PowerPC/ppc64-encoding-bookII.txt
  test/MC/PowerPC/ppc64-encoding-bookII.s

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