Lazier return in UnionType->isSuperTypeOfWithReason() (~40% faster)
          
            #5997
        
      | Job | Run time | 
|---|---|
| 1m 28s | |
| 1m 52s | |
| 1m 49s | |
| 1m 50s | |
| 1m 31s | |
| 1m 21s | |
| 1m 31s | |
| 1m 57s | |
| 13m 19s |