Fix SEND_USER with ref arg

Even though the input is not a reference (or not treated as such),
we still need to create a reference to satisfy the function
signature. Various code reli

Fix SEND_USER with ref arg

Even though the input is not a reference (or not treated as such),
we still need to create a reference to satisfy the function
signature. Various code relies on reference arguments actually
being references. In this particular case, it would result in
a JIT crash.

The zend_call_function() implementation already handled this
correctly.

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