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

[Frederic Riss]

Hi dblaikie, echristo, aprantl,

This is the merge of 2 patches:

Pass the DWARFUnit to DWARFDebugLine::getFileNameByIndex().

This way it can query the compilation dir when it is referenced (when a file references directory index 0, it refers to the compilation dir).

and:

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

This patch pretty prints the contents of the DW_AT_decl_file, DW_AT_call_file, DW_AT_decl_line and DW_AT_call line attributes.
Drop the const on the passed DWARFUnit to be able to call getLineTableForUnit (the line table construction is lazy, thus the getter might modify the Unit).

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/X86/fission-cu.ll
  test/DebugInfo/namespace.ll
  test/MC/MachO/gen-dwarf.s
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