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

src/compiler/js-builtin-reducer.h

Index: src/compiler/js-builtin-reducer.h
diff --git a/src/compiler/js-builtin-reducer.h b/src/compiler/js-builtin-reducer.h
index eb23cf5f3916013728a518a06ae2f77c333a201e..284687cffbb283576dfc7a882bca6748d477412d 100644
--- a/src/compiler/js-builtin-reducer.h
+++ b/src/compiler/js-builtin-reducer.h
@@ -33,10 +33,12 @@ class JSBuiltinReducer final : public AdvancedReducer {
   Reduction ReduceFunctionCall(Node* node);
   Reduction ReduceMathMax(Node* node);
   Reduction ReduceMathImul(Node* node);
+  Reduction ReduceMathCeil(Node* node);
   Reduction ReduceMathFloor(Node* node);
   Reduction ReduceMathFround(Node* node);
-  Reduction ReduceMathSqrt(Node* node);
   Reduction ReduceMathRound(Node* node);
+  Reduction ReduceMathSqrt(Node* node);
+  Reduction ReduceMathTrunc(Node* node);
 
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }