[PATCH] [mips] Add assembler support for '.set mipsX'.

[Toma Tabacu]

For MipsAsmParser.cpp:
Corrected grammar in comment (double "by") in line 54.

For MipsTargetStreamer.cpp:
Added dummy implementations of the functions introduced by the patch to the MipsTargetStreamer class.
Added "setCanHaveModuleDir(false);" to the definitions of the functions introduced by the patch in both MipsTargetAsmStreamer and MipsTargetELFStreamer classes.

For MipsTargetStreamer.h:
Changed virtual member functions of MipsTargetStreamer introduced by the patch to not be pure virtual functions.

For set-mips-directives-bad.s:
Addressed a concern about the comment.

Rebased to trunk.

http://reviews.llvm.org/D4123

Files:
  include/llvm/MC/MCSubtargetInfo.h
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
  lib/Target/Mips/MipsTargetStreamer.h
  test/MC/Mips/set-mips-directives-bad.s
  test/MC/Mips/set-mips-directives.s
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