[PATCH] Support DWARF discriminators in object streamer.

[Diego Novillo]

  Remove -g from llvm-mc call. Hand-code DWARF directives to work
  around llvm-dwarfdump limitations (http://llvm.org/bugs/show_bug.cgi?id=18840).

Hi echristo,

http://llvm-reviews.chandlerc.com/D2794

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2794?vs=7131&id=7134#toc

Files:
  lib/DebugInfo/DWARFDebugLine.cpp
  lib/DebugInfo/DWARFDebugLine.h
  lib/MC/MCDwarf.cpp
  test/DebugInfo/X86/ending-run.ll
  test/DebugInfo/X86/line-info.ll
  test/MC/ELF/discriminator.s
  test/MC/MachO/gen-dwarf-cpp.s
  test/MC/MachO/gen-dwarf.s
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