[GIT-PULLS] [php-src] PR #23492: Fix weakref unregister assertion after stack overflow

[email protected] (2akouwu)
Newsgroups php.git-pulls
Message-ID <[email protected]> 
Pull Request: https://github.com/php/php-src/pull/23492
Author: 2akouwu

Fixes #22650.

Handle the narrow case where a WeakReference is being unregistered after its referent has already disappeared from EG(weakrefs) during stack-overflow unwinding. Clear the stale IS_OBJ_WEAKLY_REFERENCED flag and return instead of asserting on a registry entry that is no longer present. Normal registered weakref invariants remain unchanged.
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