[PATCH] Add a new pass to compute DWARF path discriminators.

[Diego Novillo]

  Fixlet for -save-temps.

  When using -save-temps, the 'discriminator' keyword was not emitted
  with the proper formatting. It needs a space before it. The 'isa'
  keyword had the same problem.

Hi echristo,

http://llvm-reviews.chandlerc.com/D2691

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2691?vs=7008&id=7009#toc

Files:
  include/llvm/DIBuilder.h
  include/llvm/DebugInfo.h
  include/llvm/InitializePasses.h
  include/llvm/Transforms/Scalar.h
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  lib/IR/DIBuilder.cpp
  lib/IR/DebugInfo.cpp
  lib/IR/LLVMContextImpl.h
  lib/MC/MCAsmStreamer.cpp
  lib/MC/MCDwarf.cpp
  lib/Transforms/Scalar/SampleProfile.cpp
  lib/Transforms/Utils/AddDiscriminators.cpp
  lib/Transforms/Utils/CMakeLists.txt
  lib/Transforms/Utils/Utils.cpp
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