[pull] master from php:master#100
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Normally we prevent generators from being resumed while they are already running, but we failed to do so for generators delegating to non-Generators. As a result such generator can be resumed, terminated, which causes unexpected results (crashes) later. In gh19306.phpt in particular, the generator delegate It::getIterator() suspends while being called by generator g(). We then resume g(), which throws while trying to resume It::getIterator(). This causes g() and It::getIterator() to be released. We then UAF when resuming the Fiber in It::getIterator(). Fix this by ensuring that generators are marked as running while they fetch the next value from the delegate. Fixes GH-19306 Closes GH-19315
* PHP-8.3: Prevent resumption of generator suspended in yield from
* PHP-8.4: Prevent resumption of generator suspended in yield from
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