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

[Diego Novillo]

  Fix buglet in DILocation::getDiscriminator. It only makes sense
  to lookup a discriminator on lexical blocks. Before looking it up,
  make sure that the location's scope is a lexical block.

Hi echristo,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2691?vs=7182&id=7280#toc

Files:
  docs/SourceLevelDebugging.rst
  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/Transforms/Utils/AddDiscriminators.cpp
  lib/Transforms/Utils/CMakeLists.txt
  lib/Transforms/Utils/Utils.cpp
  test/Transforms/AddDiscriminators/basic.ll
  test/Transforms/AddDiscriminators/first-only.ll
  test/Transforms/AddDiscriminators/multiple.ll
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