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Having the hash table key change during iteration is bad, so make it impossible. Nothing relied on the key type not being const. (This is also necessary to be able to call the const version of iterator_facade_base::operator->(). Nothing calls this, and nothing will, but I tried using it locally during development and it took me a while to understand what was going wrong.) Also rename the iterator typedef to const_iterator. No behavior change. Differential Revision: https://reviews.llvm.org/D64641 llvm-svn: 366060
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