[PATCH] [PPC64] Add ABI support for v1i128

[Kit Barton]

Hi wschmidt, hfinkel, nemanjai, seurer, uweigand,

This patch adds ABI support for v1i128 data type.
It adds v1i128 to the appropriate register classes and checks parameter passing and return values.

This is related to http://reviews.llvm.org/D9081, which will add instructions that exploit the v1i128 datatype.

http://reviews.llvm.org/D9475

Files:
  lib/Target/PowerPC/PPCCallingConv.td
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCInstrAltivec.td
  lib/Target/PowerPC/PPCInstrVSX.td
  lib/Target/PowerPC/PPCRegisterInfo.td
  test/CodeGen/PowerPC/ppc64-i128-abi.ll

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