[PATCH] Turn local DWARFContext helpers getFileNameForUnit() and getFileLineInfoForCompileUnit() into full-blowm DWARFDebugLine::LineTable methods.

[Frederic Riss]

 - remove now useless includes and forward declarations.
 - add comment to new member function
 - code changes as per review comments

http://reviews.llvm.org/D5354

Files:
  lib/DebugInfo/DWARFContext.cpp
  lib/DebugInfo/DWARFDebugLine.cpp
  lib/DebugInfo/DWARFDebugLine.h
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