[PATCH] Prevent LoopConvert from shadowing already defined variables with the same name as the loop variable.

[Ariel Bernal]

  - Now it handles using directives, I missed that before.
  - Added tests to verify naming conflicts.

Hi revane, klimek, doug.gregor,

http://llvm-reviews.chandlerc.com/D950

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D950?vs=2452&id=2513#toc

Files:
  cpp11-migrate/LoopConvert/VariableNaming.cpp
  test/cpp11-migrate/LoopConvert/naming-conflict.cpp
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