Revert of [turbofan] Remove left-over change bits from ChangeLowering.

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 170 matching lines @@
     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();
+    op = simplified()->ChangeBitToBool();
   } else if (IsWord(output_rep)) {
     if (output_type->Is(Type::Signed31())) {
-      op = simplified()->ChangeInt31ToTaggedSigned();
+      op = simplified()->ChangeInt31ToTagged();
     } 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);
     }
   } else if (output_rep ==
              MachineRepresentation::kFloat32) {  // float32 -> float64 -> tagged
     node = InsertChangeFloat32ToFloat64(node);
     // TODO(bmeurer): Pass -0 hint to ChangeFloat64ToTagged.
     op = simplified()->ChangeFloat64ToTagged();
   } else if (output_rep == MachineRepresentation::kFloat64) {
     if (output_type->Is(Type::Signed31())) {  // float64 -> int32 -> tagged
       node = InsertChangeFloat64ToInt32(node);
-      op = simplified()->ChangeInt31ToTaggedSigned();
+      op = simplified()->ChangeInt31ToTagged();
     } else if (output_type->Is(
                    Type::Signed32())) {  // float64 -> int32 -> tagged
       node = InsertChangeFloat64ToInt32(node);
       op = simplified()->ChangeInt32ToTagged();
     } else if (output_type->Is(
                    Type::Unsigned32())) {  // float64 -> uint32 -> tagged
       node = InsertChangeFloat64ToUint32(node);
       op = simplified()->ChangeUint32ToTagged();
     } else {
       // TODO(bmeurer): Pass -0 hint to ChangeFloat64ToTagged.
@@ skipping 189 matching lines @@
              value.is_identical_to(factory()->false_value()));
       return jsgraph()->Int32Constant(
           value.is_identical_to(factory()->true_value()) ? 1 : 0);
     }
     default:
       break;
   }
   // Select the correct X -> Bit operator.
   const Operator* op;
   if (output_rep == MachineRepresentation::kTagged) {
-    op = simplified()->ChangeTaggedToBit();
+    op = simplified()->ChangeBoolToBit();
   } else {
     return TypeError(node, output_rep, output_type,
                      MachineRepresentation::kBit);
   }
   return jsgraph()->graph()->NewNode(op, node);
 }
 
 
 Node* RepresentationChanger::GetWord64RepresentationFor(
     Node* node, MachineRepresentation output_rep, Type* output_type) {
@@ skipping 134 matching lines @@
 }
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8