[turbofan] Use an IntPtrConstant in WordEqual comparisons.

src/compiler/representation-change.cc

 // Copyright 2015 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/representation-change.h"
 
 #include <sstream>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 658 matching lines @@
   } else if (output_rep == MachineRepresentation::kTagged ||
              output_rep == MachineRepresentation::kTaggedPointer) {
     if (output_type->Is(Type::BooleanOrNullOrUndefined())) {
       // true is the only trueish Oddball.
       op = simplified()->ChangeTaggedToBit();
     } else {
       op = simplified()->TruncateTaggedToBit();
     }
   } else if (output_rep == MachineRepresentation::kTaggedSigned) {
     node = jsgraph()->graph()->NewNode(machine()->WordEqual(), node,
-                                       jsgraph()->ZeroConstant());
+                                       jsgraph()->IntPtrConstant(0));
     return jsgraph()->graph()->NewNode(machine()->Word32Equal(), node,
                                        jsgraph()->Int32Constant(0));
   } else if (IsWord(output_rep)) {
     node = jsgraph()->graph()->NewNode(machine()->Word32Equal(), node,
                                        jsgraph()->Int32Constant(0));
     return jsgraph()->graph()->NewNode(machine()->Word32Equal(), node,
                                        jsgraph()->Int32Constant(0));
   } else if (output_rep == MachineRepresentation::kFloat32) {
     node = jsgraph()->graph()->NewNode(machine()->Float32Abs(), node);
     return jsgraph()->graph()->NewNode(machine()->Float32LessThan(),
@@ skipping 269 matching lines @@
 }
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8