mkBuiltinUnique :: Int -> Unique
mkBuiltinUnique i = mkUnique 'B' i
-mkPseudoUnique1 i = mkUnique 'C' i -- used for getItsUnique on Regs
+mkPseudoUnique1 i = mkUnique 'C' i -- used for uniqueOf on Regs
mkPseudoUnique2 i = mkUnique 'D' i -- ditto
mkPseudoUnique3 i = mkUnique 'E' i -- ditto