[PATCH] Add support for VSX FMA single-precision instructions to the PPC back end

[Nemanja Ivanovic]

Hi hfinkel, wschmidt, kbarton, seurer,

This patch adds the floating point multiply-add instructions. Double precision variants already exist, single precision variants added in ISA 2.07. he following instructions are added:
xsmaddasp 
xsmaddmsp 
xsmsubasp 
xsmsubmsp 
xsnmaddasp 
xsnmaddmsp 
xsnmsubasp 
xsnmsubmsp

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9941

Files:
  lib/Target/PowerPC/PPCInstrVSX.td
  test/CodeGen/PowerPC/fma.ll
  test/MC/Disassembler/PowerPC/vsx.txt
  test/MC/PowerPC/vsx.s

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