Fix use after free when WeakMap is modified during field write #7671
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(When a value's destructor triggers a resizing or rehashing of the WeakMap)
Prior to this PR, this test case would cause errors with
USE_ZEND_ALLOC=0
ormake test TESTS=-m
(impliesUSE_ZEND_ALLOC=0
)(This type of issue is similar to another (fixed) bug I reported for SplFixedArray - https://bugs.php.net/bug.php?id=81429)