[PATCH] Have LoopConvert use 'auto &&' where necessary

[Edwin Vane]

Hi gribozavr, klimek,

For iterators where the dereference operator returns by value,
LoopConvert should use 'auto &&' in the range-based for loop expression.

Moved test case from iterator_failing.cpp to iterator.cpp and added
extra tests.

Fixes PR15437.

http://llvm-reviews.chandlerc.com/D500

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/iterator_failing.cpp
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