[PATCH] Emission of BUILD_VECTORs can be incorrect in BE mode - movi, fmov, mvni

[Asiri Rathnayake]

Hi t.p.northover,

Continued from http://reviews.llvm.org/D5097

This patch introduces a natural-vector-cast DAG operation which does not generate REV instructions in big-endian mode (unlike ISD:BITCAST).

Currently the patch only fixes movi, fmov and mvni encoded BUILD_VECTORs. If it looks good, I can expand it to fix bic and orr encoded BUILD_VECTORs as well (which are also broken atm).

Asiri.

http://reviews.llvm.org/D5170

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/AArch64/AArch64InstrInfo.td
  test/CodeGen/AArch64/aarch64-be-bv.ll
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