[PATCH] Use 'auto const&' for iterators whose deref operator returns a const var

[Ariel Bernal]

Hi revane,

This patch is based on http://llvm-reviews.chandlerc.com/D641 by Tareq.

- This patch fixes Bugzilla: PR15601
- Added check for whether the loop variable and the variable's initializer have the same type.
- Added and fixed tests.

http://llvm-reviews.chandlerc.com/D759

Files:
  cpp11-migrate/LoopConvert/LoopActions.cpp
  cpp11-migrate/LoopConvert/LoopActions.h
  cpp11-migrate/LoopConvert/LoopMatchers.cpp
  cpp11-migrate/LoopConvert/LoopMatchers.h
  test/cpp11-migrate/LoopConvert/Inputs/structures.h
  test/cpp11-migrate/LoopConvert/iterator.cpp
  test/cpp11-migrate/LoopConvert/naming-conflict.cpp
  test/cpp11-migrate/LoopConvert/nesting.cpp
  test/cpp11-migrate/LoopConvert/single-iterator.cpp
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