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

[Ariel Bernal]

  - Fixed tests to verify basic functionality using iterator instead of const_iterator.
  - Added new tests to check for const qualification.
  - Fixed cases where the variable and the initializer were both of the same type const_iterator (we just use auto in that case).

Hi revane,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D759?vs=1891&id=1900#toc

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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