Fix assertion failure in zend_std_read_property

We asserted that Z_PROP_FLAG_P(retval) was exactly IS_PROP_UNINIT, but this is a
bit field and it may contain irrelevant bits. For instanc

Fix assertion failure in zend_std_read_property

We asserted that Z_PROP_FLAG_P(retval) was exactly IS_PROP_UNINIT, but this is a
bit field and it may contain irrelevant bits. For instance it may contain
IS_PROP_REINITABLE during clone, or IS_PROP_LAZY if the object is lazy.

Fixes GH-16615
Closes GH-16639

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