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

[Toma Tabacu]

Addressed review comments.
Fixed duplicate emission of JALR when expanding a "JAL symbol".
Removed redundant test cases.
Added NOT checks.
Cleaned up tests.


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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