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

[Oliver Stannard]

  After rebasing, one test has started failing: test/MC/ELF/gen-dwarf.s. This was because we do not track which sections have had instructions emitted when we are emitting assembly (as opposed to object files). My patch was using this information to avoid emitting DWARF information for empty sections. Because of this, I have modified my patch to emit DWARF for all sections.

Hi echristo, rengolin,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2697?vs=7876&id=8304#toc

Files:
  include/llvm/MC/MCContext.h
  include/llvm/MC/MCObjectStreamer.h
  include/llvm/MC/MCStreamer.h
  lib/MC/MCDwarf.cpp
  lib/MC/MCParser/AsmParser.cpp
  lib/MC/MCParser/ELFAsmParser.cpp
  test/MC/ARM/dwarf-asm-multiple-sections.s
  test/MC/ARM/dwarf-asm-single-section.s
  test/MC/ELF/gen-dwarf.s
  tools/llvm-mc/llvm-mc.cpp
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