[builtins] Make Math.ceil, Math.trunc and Math.round optimizable.

src/compiler/simplified-operator.h

Index: src/compiler/simplified-operator.h
diff --git a/src/compiler/simplified-operator.h b/src/compiler/simplified-operator.h
index 8aa0118bea0851eb4bf432c4a4a950a2093c1a32..6cd85c37e9aadd9e84b5a89a7bde1a7e259c4c18 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -143,7 +143,10 @@ class SimplifiedOperatorBuilder final : public ZoneObject {
   const Operator* NumberShiftLeft();
   const Operator* NumberShiftRight();
   const Operator* NumberShiftRightLogical();
+  const Operator* NumberCeil();
   const Operator* NumberFloor();
+  const Operator* NumberRound();
+  const Operator* NumberTrunc();
   const Operator* NumberToInt32();
   const Operator* NumberToUint32();
   const Operator* NumberIsHoleNaN();