Upgrade V8 to 5.1.281.57  DO NOT MERGE

FPIIM-449

Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
(cherry picked from commit 3b9bc31999c9787eb726ecdbfd5796bfdec32a18)
diff --git a/src/compiler/js-builtin-reducer.h b/src/compiler/js-builtin-reducer.h
index b64b335..dfeb409 100644
--- a/src/compiler/js-builtin-reducer.h
+++ b/src/compiler/js-builtin-reducer.h
@@ -33,8 +33,13 @@
   Reduction ReduceFunctionCall(Node* node);
   Reduction ReduceMathMax(Node* node);
   Reduction ReduceMathImul(Node* node);
+  Reduction ReduceMathCeil(Node* node);
+  Reduction ReduceMathClz32(Node* node);
+  Reduction ReduceMathFloor(Node* node);
   Reduction ReduceMathFround(Node* node);
   Reduction ReduceMathRound(Node* node);
+  Reduction ReduceMathSqrt(Node* node);
+  Reduction ReduceMathTrunc(Node* node);
 
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }