SSA: Skip calling into CG for zero-width shadows/outlines
SSA: Skip calling into CG for zero-width shadows/outlines

This shouldn't cause a behavior change, but if it does, then the new behavior
is more correct.


JanX2/Perian,JanX2/Perian,JanX2/Perian,JanX2/Perian,JanX2/Perian