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

[Diego Novillo]

  This update fixes the failures I was getting before. Instead of
  modifying the DILexicalBlock after creation, I've changed
  DIBuilder::createLexicalBlock to accept a discriminator value. This
  seems cleaner as well.

  I suppose that when I was mutating the block, this was invalidating
  some caching done by the MDNode machinery? I'm not really sure what
  was happening.

  With this I get no ICEs, but I still don't seem to fully get
  discriminators all the way down to the executable. Is there any other
  place for me to look at?

Hi echristo,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2691?vs=6967&id=6993#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/MCObjectStreamer.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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