[turbofan] Properly handle bit->tagged representation changes.

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 166 matching lines @@
     case IrOpcode::kNumberConstant:
     case IrOpcode::kHeapConstant:
       return node;  // No change necessary.
     case IrOpcode::kInt32Constant:
       if (output_type->Is(Type::Signed32())) {
         int32_t value = OpParameter<int32_t>(node);
         return jsgraph()->Constant(value);
       } else if (output_type->Is(Type::Unsigned32())) {
         uint32_t value = static_cast<uint32_t>(OpParameter<int32_t>(node));
         return jsgraph()->Constant(static_cast<double>(value));
-      } else if (output_rep == MachineRepresentation::kBit) {
+      } else if (output_type->Is(Type::Boolean())) {
         return OpParameter<int32_t>(node) == 0 ? jsgraph()->FalseConstant()
                                                : jsgraph()->TrueConstant();
       } else {
         return TypeError(node, output_rep, output_type,
                          MachineRepresentation::kTagged);
       }
     case IrOpcode::kFloat64Constant:
       return jsgraph()->Constant(OpParameter<double>(node));
     case IrOpcode::kFloat32Constant:
       return jsgraph()->Constant(OpParameter<float>(node));
     default:
       break;
   }
   // Select the correct X -> Tagged operator.
   const Operator* op;
   if (output_rep == MachineRepresentation::kBit) {
-    op = simplified()->ChangeBitToTagged();
+    if (output_type->Is(Type::Boolean())) {
+      op = simplified()->ChangeBitToTagged();
+    } else {
+      return TypeError(node, output_rep, output_type,
+                       MachineRepresentation::kTagged);
+    }
   } else if (IsWord(output_rep)) {
     if (output_type->Is(Type::Signed31())) {
       op = simplified()->ChangeInt31ToTaggedSigned();
     } else if (output_type->Is(Type::Signed32())) {
       op = simplified()->ChangeInt32ToTagged();
     } else if (output_type->Is(Type::Unsigned32())) {
       op = simplified()->ChangeUint32ToTagged();
     } else {
       return TypeError(node, output_rep, output_type,
                        MachineRepresentation::kTagged);
@@ skipping 606 matching lines @@
 }
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8