Fix OSS-Fuzz #69765: Yield reference to nullsafe chain

You cannot return or yield a reference to a nullsafe chain. This was
checked already in zend_compile_return but not yet in
zend

Fix OSS-Fuzz #69765: Yield reference to nullsafe chain

You cannot return or yield a reference to a nullsafe chain. This was
checked already in zend_compile_return but not yet in
zend_compile_yield.

Closes GH-14716.

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