[PATCH] [PPC] Implement vmrgew and vmrgow instructions

[Kit Barton]

Hi wschmidt, hfinkel, seurer, nemanjai,

This patch adds support for the vector merge even word and vector merge odd word instructions introduced in POWER8.

http://reviews.llvm.org/D10704

Files:
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Target/PowerPC/PPCInstrAltivec.td
  test/CodeGen/PowerPC/vec_mergeow.ll
  test/MC/Disassembler/PowerPC/ppc64-encoding-vmx.txt
  test/MC/PowerPC/ppc64-encoding-vmx.s

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