[turbofan] Change number operations to handle Undefined as well.

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 235 matching lines @@
                truncation.TruncatesToWord32()) {
       // Either the output is uint32 or the uses only care about the
       // low 32 bits (so we can pick uint32 safely).
 
       // uint32 -> float64 -> float32
       op = machine()->ChangeUint32ToFloat64();
       node = jsgraph()->graph()->NewNode(op, node);
       op = machine()->TruncateFloat64ToFloat32();
     }
   } else if (output_rep == MachineRepresentation::kTagged) {
-    if (output_type->Is(Type::Number())) {
+    if (output_type->Is(Type::NumberOrUndefined())) {
       op = simplified()
                ->ChangeTaggedToFloat64();  // tagged -> float64 -> float32
       node = jsgraph()->graph()->NewNode(op, node);
       op = machine()->TruncateFloat64ToFloat32();
     }
   } else if (output_rep == MachineRepresentation::kFloat64) {
     op = machine()->TruncateFloat64ToFloat32();
   }
   if (op == nullptr) {
     return TypeError(node, output_rep, output_type,
@@ skipping 31 matching lines @@
   if (IsWord(output_rep)) {
     if (output_type->Is(Type::Signed32())) {
       op = machine()->ChangeInt32ToFloat64();
     } else if (output_type->Is(Type::Unsigned32()) ||
                truncation.TruncatesToWord32()) {
       // Either the output is uint32 or the uses only care about the
       // low 32 bits (so we can pick uint32 safely).
       op = machine()->ChangeUint32ToFloat64();
     }
   } else if (output_rep == MachineRepresentation::kTagged) {
-    if (output_type->Is(Type::Number())) {
+    if (output_type->Is(Type::NumberOrUndefined())) {
       op = simplified()->ChangeTaggedToFloat64();
     }
   } else if (output_rep == MachineRepresentation::kFloat32) {
     op = machine()->ChangeFloat32ToFloat64();
   }
   if (op == nullptr) {
     return TypeError(node, output_rep, output_type,
                      MachineRepresentation::kFloat64);
   }
   return jsgraph()->graph()->NewNode(op, node);
@@ skipping 211 matching lines @@
 
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8