[PATCH] [mips][microMIPS] Implement LWSP and SWSP instructions

[Jozef Kolek]

Implemented assembler pseudo instructions LW/SW: If offset fits into 7 bits and base register is SP then create LWSP/SWSP encoding instead of LW/SW.


http://reviews.llvm.org/D6416

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/Disassembler/MipsDisassembler.cpp
  lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
  lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.h
  lib/Target/Mips/MicroMipsInstrFormats.td
  lib/Target/Mips/MicroMipsInstrInfo.td
  test/MC/Disassembler/Mips/micromips.txt
  test/MC/Disassembler/Mips/micromips_le.txt
  test/MC/Mips/micromips-16-bit-instructions.s

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