[PATCH] [ARM64] Print preferred aliases for SFBM/UBFM in InstPrinter

[Bradley Smith]

Hi t.p.northover,

The ARM64 InstPrinter does not print the preferred form of SBFM/UBFM instructions, this patch fixes this such that SBFIZ/SBFX/SXTB etc are instead printed where preferred. Additionally 64-bit variants of UXTB/H/W should never be printed since they are not part of the architecture, but rather a logical extension of the aliases.

http://reviews.llvm.org/D3503

Files:
  lib/Target/ARM64/InstPrinter/ARM64InstPrinter.cpp
  test/CodeGen/AArch64/bitfield.ll
  test/CodeGen/AArch64/bool-loads.ll
  test/CodeGen/ARM64/aapcs.ll
  test/CodeGen/ARM64/bitfield-extract.ll
  test/CodeGen/ARM64/fast-isel-conversion.ll
  test/CodeGen/ARM64/fold-lsl.ll
  test/CodeGen/ARM64/shifted-sext.ll
  test/MC/ARM64/aliases.s
  test/MC/ARM64/bitfield-encoding.s
  test/MC/Disassembler/ARM64/bitfield.txt
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