[PATCH] Add DWARF discriminator support to DILexicalBlocks

[Diego Novillo]

Hi echristo,

This adds support for emitting discriminators from DILexicalBlocks. Factored from http://llvm-reviews.chandlerc.com/D2691.

http://llvm-reviews.chandlerc.com/D2891

Files:
  docs/SourceLevelDebugging.rst
  include/llvm/DIBuilder.h
  include/llvm/DebugInfo.h
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  lib/IR/DIBuilder.cpp
  lib/IR/DebugInfo.cpp
  test/DebugInfo/X86/discriminator.ll
  lib/CodeGen/CGDebugInfo.cpp
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