[PATCH] [mips] [IAS] Add support for the XOR $reg, imm pseudo-instruction.

[Toma Tabacu]

Hi dsanders,

This adds a MipsInstAlias which expands to XORi $reg,$reg,imm. For example, "xor $6, 0x3A" should be expanded to "xori $6, $6, 58".
This should work for all MIPS ISAs.

http://reviews.llvm.org/D8284

Files:
  lib/Target/Mips/MipsInstrInfo.td
  test/MC/Mips/mips1/valid.s
  test/MC/Mips/mips2/valid.s
  test/MC/Mips/mips3/valid.s
  test/MC/Mips/mips32/valid.s
  test/MC/Mips/mips32r2/valid.s
  test/MC/Mips/mips32r3/valid.s
  test/MC/Mips/mips32r5/valid.s
  test/MC/Mips/mips32r6/valid.s
  test/MC/Mips/mips4/valid.s
  test/MC/Mips/mips5/valid.s
  test/MC/Mips/mips64/valid.s
  test/MC/Mips/mips64r2/valid.s
  test/MC/Mips/mips64r3/valid.s
  test/MC/Mips/mips64r5/valid.s
  test/MC/Mips/mips64r6/valid.s

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