[PATCH] Emit DWARF info for all code section in an assembly file

[Renato Golin]

  Eric,

  Things like:

  $ llvm-mc -gdwarf-2 -gdwarf-3 -gdwarf-4

  llvm-mc doesn't have the tools Clang has for dealing with multiple contradictory compiler flags. Since llvm-mc is an internal tool, we don't need to deal with it, so just make it an error.

  cheers,
  --renato

http://llvm-reviews.chandlerc.com/D2697