d402a4da6bfdf4484afb6957661f1dbddbda2e5f

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@217903 91177308-0d34-0410-b5e6-96231b3b80d8
Create a 'comma_iterator' class that overloads operator, and asserts when it's called. Add tests to mismatch to make sure it can't be blindsided by such an evil iterator. More tests for other algorithms forthcoming. Thanks to STL for pointing this out at CppCon and Yakov Galka for opening LWG issue #2133
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