[GIT-PULLS] [php-src] PR #23489: Avoid execute_data assertion while checking generator fiber state

[email protected] (2akouwu)
Newsgroups php.git-pulls
Message-ID <[email protected]> 
Pull Request: https://github.com/php/php-src/pull/23489
Author: 2akouwu

Fixes #20615.

Generator delegation trees can contain closed intermediate nodes while a descendant is running in a Fiber. The fiber-state walk only needs node flags and child links, so do not require execute_data to be present. Extend the existing Fiber destructor test with the reported regression scenario.
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