[PATCH] [AArch64 NEON] Support poly128_t and implement relevant intrinsic.

[Kevin Qin]

Hi,

This patch implement ACLE intrinsic with poly128_t newly introduced. Because of Clang and LLVM limits(quite a lot of APIs about i128 doesn't exist), the LLVM intrinsic is defined on v16i8 instead of i128. This is a work around solution, but in current framework, it is the simplest way to get poly128_t supported. Please review. Thanks.

http://llvm-reviews.chandlerc.com/D2344

Files:
  include/llvm/IR/IntrinsicsAArch64.td
  lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64InstrNEON.td
  test/CodeGen/AArch64/128bit_load_store.ll
  test/CodeGen/AArch64/neon-3vdiff.ll
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