[PATCH] [dwarfdump] Implement extraction of file information referenced in .debug_info.

[Frederic Riss]

The line number portion is in. Rebase:

  - Turn DWARFContext helpers getFileNameForUnit() and getFileLineInfoForCompileUnit() into full blowm DWARFDebugLine::LineTable methods.
  - [dwarfdump] Dump full filenames as DW_AT_(decl|call)_file attribute values

http://reviews.llvm.org/D5192

Files:
  lib/DebugInfo/DWARFContext.cpp
  lib/DebugInfo/DWARFDebugInfoEntry.cpp
  lib/DebugInfo/DWARFDebugInfoEntry.h
  lib/DebugInfo/DWARFDebugLine.cpp
  lib/DebugInfo/DWARFDebugLine.h
  test/DebugInfo/X86/2011-09-26-GlobalVarContext.ll
  test/DebugInfo/namespace.ll
  test/MC/MachO/gen-dwarf.s
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