[PATCH] Make getUnitForOffset a DWARFUnit method instead of a DWARFContext method.

[Frederic Riss]

Rewrite the patch according to Alexey's comments. 

This patch introduces the DWARFUnitSection abstraction that is a collection
of units with a generic base class allowing to query for the Unit containing
a certain offset.

This patch should induce no functional change.

http://reviews.llvm.org/D5310

Files:
  lib/DebugInfo/DWARFCompileUnit.h
  lib/DebugInfo/DWARFContext.cpp
  lib/DebugInfo/DWARFContext.h
  lib/DebugInfo/DWARFTypeUnit.h
  lib/DebugInfo/DWARFUnit.cpp
  lib/DebugInfo/DWARFUnit.h
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