427a5cf105
This patch introduces a new kind of bounded iterator that knows the size of its valid range at compile-time, as in std::array. This allows computing the end of the range from the start of the range and the size, which requires storing only the start of the range in the iterator instead of both the start and the size (or start and end). The iterator wrapper is otherwise identical in design to the existing __bounded_iter. Since this requires changing the type of the iterators returned by std::array, this new bounded iterator is controlled by an ABI flag. As a drive-by, centralize the tests for std::array::operator[] and add missing tests for OOB operator[] on non-empty arrays. Fixes #70864
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