Fix compilation error on mac with -Wshift-negative-value

Fix compilation error on mac with -Wshift-negative-value

Fix for mac OS build error seen in ccc49ead681add7bdf6a021c7a3420aff543bc1e
when shifting -1 (max argument count?)

```
ext/opcache/jit/zend_jit_trace.c:1668:2:
error: shifting a negative signed value is undefined
[-Werror,-Wshift-negative-value]
        TRACE_FRAME_INIT(frame, op_array, 0, -1);
```

Closes GH-5284.