[PATCH] Fix bug 19437 - Only add discriminators for DWARF 4 and above.

[Diego Novillo]

  Move getDwarfVersionFromModule into Dwarf.h.

Hi echristo, dblaikie,

http://reviews.llvm.org/D3413

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3413?vs=8610&id=8611#toc

Files:
  include/llvm/Support/Dwarf.h
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  lib/Transforms/Utils/AddDiscriminators.cpp
  test/Transforms/AddDiscriminators/no-discriminators.ll
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