[PATCH] [mips] Add assembler support for the .cprestore directive.

[Toma Tabacu]

Outlined the (inPicMode() && !(isABI_N32() || isABI_N64())) condition into a separate function.
Switched to using !isInt<16>() in createCpRestoreMemOp() if condition.
Moved forbidModuleDirective() calls to the MipsTargetStreamer base class.
Removed redundant addition to the .set reorder NOP-creation condition.
Improved code comments to better explain why we need a NOP after the JALR in .set noreorder.

I believe this addresses all the remaining review comments for this patch.


http://reviews.llvm.org/D6267

Files:
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
  lib/Target/Mips/MipsTargetStreamer.h
  test/MC/Mips/cprestore-bad.s
  test/MC/Mips/cprestore-noreorder.s
  test/MC/Mips/cprestore-reorder.s
  test/MC/Mips/cprestore-warning-unused.s

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