Fix GH-10248: Assertion `!(zval_get_type(&(*(property))) == 10)' failed.

The assertion failure was triggered in a debug code-path that validates
property types for internal classes.

Fix GH-10248: Assertion `!(zval_get_type(&(*(property))) == 10)' failed.

The assertion failure was triggered in a debug code-path that validates
property types for internal classes.
zend_verify_internal_read_property_type was called with retval being a
reference, which is not allowed because that function eventually calls to
i_zend_check_property_type, which does not expect a reference.
The non-debug code-path already takes into account that retval can be a
reference, as it optionally dereferences retval.

Add a dereference in zend_verify_internal_read_property_type just before
the call to zend_verify_property_type, which is how other callers often
behave as well.

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