Fix segfault in zend_test_execute_internal()

zend_pass_function also has no name, so we might also be referring to an
internal function here. In this case, ZEND_NEW uses the zend_pass_fu

Fix segfault in zend_test_execute_internal()

zend_pass_function also has no name, so we might also be referring to an
internal function here. In this case, ZEND_NEW uses the zend_pass_function when
there is no constructor.

Fixes GH-16294
Closes GH-16301

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