Clean up some random TODO(titzer)s and spelling mistakes.

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 79 matching lines @@
     case TruncationKind::kAny:
       return rep2 == TruncationKind::kAny;
   }
   UNREACHABLE();
   return false;
 }
 
 
 namespace {
 
-// TODO(titzer): should Word64 also be implicitly convertable to others?
 bool IsWord(MachineRepresentation rep) {
   return rep == MachineRepresentation::kWord8 ||
          rep == MachineRepresentation::kWord16 ||
          rep == MachineRepresentation::kWord32;
 }
 
 }  // namespace
 
 
 // Changes representation from {output_rep} to {use_rep}. The {truncation}
@@ skipping 417 matching lines @@
 
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8