[turbofan] Lower asm.js truncations to JSToNumber.

src/compiler/js-typed-lowering.h

 // 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.
 
 #ifndef V8_COMPILER_JS_TYPED_LOWERING_H_
 #define V8_COMPILER_JS_TYPED_LOWERING_H_
 
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Lowers JS-level operators to simplified operators based on types.
 class JSTypedLowering FINAL : public Reducer {
  public:
-  explicit JSTypedLowering(JSGraph* jsgraph)
-      : jsgraph_(jsgraph), simplified_(jsgraph->zone()) {}
+  explicit JSTypedLowering(JSGraph* jsgraph);
   virtual ~JSTypedLowering();
 
   virtual Reduction Reduce(Node* node) OVERRIDE;
 
   JSGraph* jsgraph() { return jsgraph_; }
   Graph* graph() { return jsgraph_->graph(); }
   Zone* zone() { return jsgraph_->zone(); }
 
  private:
   friend class JSBinopReduction;
 
   Reduction ReplaceEagerly(Node* old, Node* node);
   Reduction ReplaceWith(Node* node) { return Reducer::Replace(node); }
   Reduction ReduceJSAdd(Node* node);
+  Reduction ReduceJSBitwiseOr(Node* node);
+  Reduction ReduceJSMultiply(Node* node);
   Reduction ReduceJSComparison(Node* node);
   Reduction ReduceJSLoadProperty(Node* node);
   Reduction ReduceJSStoreProperty(Node* node);
   Reduction ReduceJSEqual(Node* node, bool invert);
   Reduction ReduceJSStrictEqual(Node* node, bool invert);
   Reduction ReduceJSToNumberInput(Node* input);
   Reduction ReduceJSToStringInput(Node* input);
   Reduction ReduceJSToBooleanInput(Node* input);
   Reduction ReduceNumberBinop(Node* node, const Operator* numberOp);
   Reduction ReduceI32Binop(Node* node, bool left_signed, bool right_signed,
                            const Operator* intOp);
   Reduction ReduceI32Shift(Node* node, bool left_signed,
                            const Operator* shift_op);
 
   JSOperatorBuilder* javascript() { return jsgraph_->javascript(); }
   CommonOperatorBuilder* common() { return jsgraph_->common(); }
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
   MachineOperatorBuilder* machine() { return jsgraph_->machine(); }
 
   JSGraph* jsgraph_;
   SimplifiedOperatorBuilder simplified_;
+  Type* zero_range_;
+  Type* one_range_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_TYPED_LOWERING_H_