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

[bryant via Phabricator via llvm-commits]

bryant updated this revision to Diff 89565.
bryant added a comment.

- Allow `operator--` when inner iterators are random access.


Repository:
  rL LLVM

https://reviews.llvm.org/D30246

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

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