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

[Frederic Riss]

As per review comments:
 - Remove DWARFUnit * parameters to LineTable methods. Pass just the compilation dir instead.
 - Remove useless temporaries in getFileNameByIndex
 - Change the order of getFileNameByIndex arguments to be more natural

With above changes, the name getFileLineInfoForCompilationUnit didn't make any sense anymore (no more CU argument). Rename the function to getFileLineInfoForAddress instead.

http://reviews.llvm.org/D5354

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