[PATCH] [mips] Improve support for the .set at/noat assembler directives.

[Toma Tabacu]

Hi dsanders,

Made the following changes:
  Added calls to emitDirectiveSetNoAt() and emitDirectiveSetAt().
  Added special emit function for .set at=$reg, emitDirectiveSetAtWithArg(unsigned RegNo).
  Improved parsing error checks for .set at.
  Refactored parser code for .set at.
  Improved testing of both directives.
  Improved code readability and comments.

http://reviews.llvm.org/D7176

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
  lib/Target/Mips/MipsTargetStreamer.h
  test/MC/Mips/mips-noat.s
  test/MC/Mips/set-at-directive-explicit-at.s
  test/MC/Mips/set-at-directive.s
  test/MC/Mips/set-at-noat-bad-syntax.s

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