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

[Tareq A. Siraj]

Hi revane,

Check if the dereference operator for the iterator returns a const
element and use 'auto const &' in such cases.

Fixes: 15601

http://llvm-reviews.chandlerc.com/D641

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/iterator.cpp
  test/cpp11-migrate/LoopConvert/naming-conflict.cpp
  test/cpp11-migrate/LoopConvert/single-iterator.cpp
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