Add typing for Int32MulHigh.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
@@ skipping 913 matching lines @@
 Bounds Typer::Visitor::TypeInt32SubWithOverflow(Node* node) {
   return Bounds(Type::Internal());
 }
 
 
 Bounds Typer::Visitor::TypeInt32Mul(Node* node) {
   return Bounds(Type::Integral32());
 }
 
 
+Bounds Typer::Visitor::TypeInt32MulHigh(Node* node) {
+  return Bounds(Type::Integral32());
+}
+
+
 Bounds Typer::Visitor::TypeInt32Div(Node* node) {
   return Bounds(Type::Integral32());
 }
 
 
 Bounds Typer::Visitor::TypeInt32Mod(Node* node) {
   return Bounds(Type::Integral32());
 }
 
 
@@ skipping 272 matching lines @@
 }
 
 
 void Typer::DecorateGraph(Graph* graph) {
   graph->AddDecorator(new (zone()) TyperDecorator(this));
 }
 
 }
 }
 }  // namespace v8::internal::compiler