Fix stale nInternalPosition on rehashing #19323
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Since phpGH-13188 we're no longer immediately updating iterator positions when deleting array elements. zend_hash_rehash() needs to adapt accordingly by adjusting nInternalPosition for IS_UNDEF elements. This is already the case for array iterators. Fixes phpGH-19280
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Since GH-13188 we're no longer immediately updating iterator positions when deleting array elements. zend_hash_rehash() needs to adapt accordingly by adjusting nInternalPosition for IS_UNDEF elements. This is already the case for array iterators.
Fixes GH-19280