Another small optimization in rounding

Skip calculating isEven if we short-circuit ApplyUnsignedRoundingMode in
RoundNumberToIncrementAsIfPositive.

Author: ptomato

polyfill/lib/ecmascript.mjs

@@ -4040,10 +4040,9 @@ export function RoundNumberToIncrementAsIfPositive(quantity, increment, mode) {
   // Similar to the comparison in RoundNumberToIncrement, but multiplied by an
   // extra sign to make sure we treat it as positive
   const cmp = remainder.times(2).abs().compare(increment) * (quantity.lt(0) ? -1 : 1);
-  const even = r1.isEven();
   const rounded = remainder.isZero()
     ? quotient
-    : ApplyUnsignedRoundingMode(r1, r2, cmp, even, unsignedRoundingMode);
+    : ApplyUnsignedRoundingMode(r1, r2, cmp, r1.isEven(), unsignedRoundingMode);
   return rounded.times(increment);
 }