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

[Diego Novillo]

    - Move getDwarfVersionFromModule to Module::getDwarfVersion.
    - Re-arrange the checks when deciding whether to add discriminators.

Hi echristo, dblaikie, chandlerc,

http://reviews.llvm.org/D3413

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3413?vs=8611&id=8612#toc

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