gen_stub: Intern the parameter name string for named arguments in internal attributes #14595
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This is necessary because
zend_get_attribute_object()
will use the persistent string with the parameter name as the index for a newly created non-persistent HashTable, which is not legal.As parameter names are expected to be short-ish, reasonably common terms and need to sit around in memory anyways, we might as well make them an interned string, circumstepping the issue without needing to duplicate the parameter name into a non-persistent string.
Found by @Girgias during review of #11293.