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

[bryant via Phabricator via llvm-commits]

bryant created this revision.

This patch:

- Ensures that `zip_first`/`zip_shortest` inherit from the `iterator_facade_base` (which it should);
- marks `zippy::begin`/`::end` const;
- and ensures that zip plays well with `make_filter_range`.


Repository:
  rL LLVM

https://reviews.llvm.org/D30246

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

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