[PATCH] [mips] Manually replace JAL pseudo-instructions with their JALR equivalent, instead of using InstAlias.

[Toma Tabacu]

-added the MicroMips version of these expansions.
-added a test-case for the MicroMips version (note that the normal version already has a test-case in MC/Mips/mips-jump-instructions.s).
-made some minor cosmetic changes to the code in the expandJalWithRegs function.

http://reviews.llvm.org/D5601

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/MipsInstrInfo.td
  test/MC/Mips/micromips-jump-instructions.s
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