[PATCH] Add support for DebugFission to DWARF parser

[Alexey Samsonov]

Hi echristo,

1) Make llvm-symbolizer properly symbolize
files with split debug info (by using stanalone .dwo files).
2) Make DWARFCompileUnit parse and store corresponding .dwo file,
if necessary.
3) Make bits of DWARF parsing more CompileUnit-oriented.

http://llvm-reviews.chandlerc.com/D1164

Files:
  include/llvm/DebugInfo/DIContext.h
  include/llvm/DebugInfo/DWARFFormValue.h
  lib/DebugInfo/DWARFFormValue.cpp
  lib/DebugInfo/DWARFContext.cpp
  lib/DebugInfo/DWARFDebugInfoEntry.cpp
  lib/DebugInfo/DWARFDebugAranges.cpp
  lib/DebugInfo/DWARFCompileUnit.cpp
  lib/DebugInfo/DWARFContext.h
  lib/DebugInfo/DWARFDebugInfoEntry.h
  lib/DebugInfo/DWARFCompileUnit.h
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