[PATCH] [mips] [IAS] Add support for the .module softfloat/hardfloat directives.

[Toma Tabacu]

Fixed restoration of previous hardfloat settings:

- The settings aren't actually changed, it's just that when in soft-float they are ignored.
- emitDirectiveModule{SoftFloat,HardFloat}() doesn't change the MipsABIFlagsSection data anymore, it only prints it.
- That data is changed by setting/clearing the soft-float bit in STI.FeatureBits and then calling updateABIInfo().
- updateABIInfo() uses the update mechanism from MipsABIFlagsSection to properly update.

Changed test to use -mips-abi-flags feature of llvm-readobj.
Made the module-hardfloat.s test more thorough.
Rebased on top of http://reviews.llvm.org/D10641, http://reviews.llvm.org/D10642, and http://reviews.llvm.org/D10643, which fix the other .module directives.


http://reviews.llvm.org/D9073

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
  lib/Target/Mips/MipsTargetStreamer.h
  test/MC/Mips/module-hardfloat.s
  test/MC/Mips/module-softfloat.s

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