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
This commit provides `zip_{first,shortest}` with the standard member types and methods expected of iterators (e.g., `difference_type`), in order for zip to be used with other adaptors, such as `make_filter_range`. Support for reverse iteration has also been added. Differential Revision: https://reviews.llvm.org/D30246 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296036 91177308-0d34-0410-b5e6-96231b3b80d8