[PATCH] D30246: [ADT] Fix zip iterator interface.

[bryant via Phabricator via llvm-commits]

bryant updated this revision to Diff 89563.
bryant added a comment.

- Use boost's difference_type calculation, even though it's not morally correct.
- Support reverse iteration, if all the inner iterators support it.


Repository:
  rL LLVM

https://reviews.llvm.org/D30246

Files:
  include/llvm/ADT/STLExtras.h
  unittests/ADT/IteratorTest.cpp

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