Louis Dionne a2fe17cdc6 [libc++] Fix reverse_iterator test when UBSan is enabled
The goal of the test was only to check that we could access the
`this->current` member of std::reverse_iterator from a derived
class, but in doing so we incremented a null iterator, which is UB.
2020-03-04 11:35:34 -05:00
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