[PATCH] [inline-asm] Fix scope of assembly macros

[Sergey Dmitrouk]

Fix second issue with `StringRef` by introducing a wrapper class that copies underlying string value. Better ideas are welcomed.

http://reviews.llvm.org/D6383

Files:
  include/llvm/CodeGen/AsmPrinter.h
  include/llvm/MC/MCParser/MCAsmParser.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
  lib/MC/MCParser/AsmParser.cpp
  test/CodeGen/Generic/inline-asm-macros-global-and-local.ll
  test/CodeGen/Generic/inline-asm-macros-local-and-local.ll
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