Handle SWITCH_STRING with optimized away FREE

This can happen in degenerate cases where we know that the
SWITCH_STRING argument is not refcounted. We should be treating it
in the sam

Handle SWITCH_STRING with optimized away FREE

This can happen in degenerate cases where we know that the
SWITCH_STRING argument is not refcounted. We should be treating it
in the same way as SWITCH_LONG here.

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