[PATCH] [PPC64] Add vector quadword add/sub instructions for POWER8

[Kit Barton]

Hi hfinkel, wschmidt, seurer, nemanjai,

Clang-related changes for http://reviews.llvm.org/D9081

Add builtins for the following vector quadword add/sub instructions introduced in POWER8:
  - vadduqm
  - vaddeuqm
  - vaddcuq
  - vaddecuq
  - vsubuqm
  - vsubeuqm
  - vsubcuq
  - vsubecuq

All builtins are added in altivec.h, and guarded with the POWER8_VECTOR and __powerpc64__ macros.

http://reviews.llvm.org/D9903

Files:
  include/clang/Basic/BuiltinsPPC.def
  lib/Headers/altivec.h
  test/CodeGen/builtins-ppc-quadword.c
  test/Headers/altivec-intrin.c

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