[PATCH] Move DWARFUnitSection from the vector API to something more semantically accurate.

[Frederic Riss]

Hi samsonov, dblaikie, aprantl, echristo,

This just introduces a bunch of wrapper methods that make more sense than push_back or operator[]. NFC.

http://reviews.llvm.org/D5369

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