[PATCH] D31171: Improve StringMap iterator support.

[Zachary Turner via Phabricator via llvm-commits]

zturner created this revision.
Herald added a subscriber: mgorny.

Make the two `StringMap` iterators support `iterator_facade_base`. This fixes some usage scenarios when passing begin and end to various STL algorithms. After doing that, it's easy to make a `StringMapKeysIterator` that only iterates keys, so I've done that as well.


https://reviews.llvm.org/D31171

Files:
  llvm/include/llvm/ADT/StringExtras.h
  llvm/include/llvm/ADT/StringMap.h
  llvm/unittests/Support/CMakeLists.txt
  llvm/unittests/Support/StringMap.cpp

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