Fix use after free when rebinding __call closure

We would end up freeing the function name twice here, once for
the original closure, and once for the rebound one.

Rather than f

Fix use after free when rebinding __call closure

We would end up freeing the function name twice here, once for
the original closure, and once for the rebound one.

Rather than further special casing the zend_closure_call_magic
case, always addref the function_name for internal functions,
the same we do for userland functions. To compensate, we need to
release the original function name when creating from callable
or call frame.

Fixes oss-fuzz #37695.

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