Fix ugly typo in HValue::UpdateRepresentation.

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 872 matching lines @@
 
   int id() const { return id_; }
   void set_id(int id) { id_ = id; }
 
   HUseIterator uses() const { return HUseIterator(use_list_); }
 
   virtual bool EmitAtUses() { return false; }
   Representation representation() const { return representation_; }
   void ChangeRepresentation(Representation r) {
     ASSERT(CheckFlag(kFlexibleRepresentation));
+    ASSERT(!CheckFlag(kCannotBeTagged) || !r.IsTagged());
     RepresentationChanged(r);
     representation_ = r;
-    if (r.IsTagged() ||
-        (r.IsDouble() && CheckFlag(kCannotBeTagged))) {
+    if (r.IsTagged()) {
       // Tagged is the bottom of the lattice, don't go any further.
       ClearFlag(kFlexibleRepresentation);
     }
   }
   virtual void AssumeRepresentation(Representation r);
 
   virtual Representation KnownOptimalRepresentation() {
     Representation r = representation();
     if (r.IsTagged()) {
       HType t = type();
@@ skipping 5734 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_