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

[Edwin Vane]

    - Prevent transformation of loops where iterator dereferences to an rvalue
      reference.
    - Added comment explaining why rvalue references are used if the
      iterator's operator*() returns by value.

Hi gribozavr, klimek,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D500?vs=1199&id=1206#toc

BRANCH
  loop_const

ARCANIST PROJECT
  clang-tools-extra

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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