[PATCH] [PPC64] Add 64-bit Vector Integer Arithmetic Instructions

[Kit Barton]

Added Subtarget parameter to the interface to getAltivecCompareInfo to test whether the doubleword compare intrinsics are available on the current subtarget.

Updated README_ALTIVEC.txt with a FIXME from the vec_add_sub_doubleword.ll testcase.


http://reviews.llvm.org/D7959

Files:
  include/llvm/IR/IntrinsicsPowerPC.td
  lib/Target/PowerPC/PPCISelDAGToDAG.cpp
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCInstrAltivec.td
  lib/Target/PowerPC/PPCSchedule.td
  lib/Target/PowerPC/README_ALTIVEC.txt
  test/CodeGen/PowerPC/vec_add_sub_doubleword.ll
  test/CodeGen/PowerPC/vec_cmpd.ll
  test/CodeGen/PowerPC/vec_minmax.ll
  test/CodeGen/PowerPC/vec_mul_even_odd.ll
  test/CodeGen/PowerPC/vec_rotate_shift.ll
  test/MC/Disassembler/PowerPC/ppc64-encoding-vmx.txt
  test/MC/PowerPC/ppc64-encoding-vmx.s

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