Massage the CodeStub class hierarchy a bit.

src/code-stubs-hydrogen.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/bailout-reason.h"
 #include "src/code-stubs.h"
 #include "src/field-index.h"
 #include "src/hydrogen.h"
@@ skipping 40 matching lines @@
   HParameter* GetParameter(int parameter) {
     DCHECK(parameter < descriptor_.GetEnvironmentParameterCount());
     return parameters_[parameter];
   }
   HValue* GetArgumentsLength() {
     // This is initialized in BuildGraph()
     DCHECK(arguments_length_ != NULL);
     return arguments_length_;
   }
   CompilationInfo* info() { return info_; }
-  HydrogenCodeStub* stub() { return info_->code_stub(); }
+  CodeStub* stub() { return info_->code_stub(); }
   HContext* context() { return context_; }
   Isolate* isolate() { return info_->isolate(); }
 
   HLoadNamedField* BuildLoadNamedField(HValue* object,
                                        FieldIndex index);
   void BuildStoreNamedField(HValue* object, HValue* value, FieldIndex index,
                             Representation representation,
                             bool transition_to_field);
 
   enum ArgumentClass {
@@ skipping 2176 matching lines @@
   // megamorphic case is handled as part of the default stub.
   DCHECK(!FLAG_vector_ics);
 
   // Probe the stub cache.
   Add<HTailCallThroughMegamorphicCache>(receiver, name);
 
   // We never continue.
   return graph()->GetConstant0();
 }
 } }  // namespace v8::internal