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

[Diego Novillo]

  With this update, we are now generating discriminators in the object
  file. The assembly streamer was already emitting discriminator values,
  but not the object streamer.

  The patch still needs tests. I will work on them next. In the meantime,
  could you start going through the patch?

  Thanks. Diego.

Hi echristo,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2691?vs=6993&id=7008#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/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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