Massage the CodeStub class hierarchy a bit.

src/compiler.h

 // 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.
 
 #ifndef V8_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 103 matching lines @@
     return construct_language_mode(GetFlag(kStrictMode), GetFlag(kStrongMode));
   }
   FunctionLiteral* function() const { return function_; }
   Scope* scope() const { return scope_; }
   Scope* script_scope() const { return script_scope_; }
   Handle<Code> code() const { return code_; }
   Handle<JSFunction> closure() const { return closure_; }
   Handle<SharedFunctionInfo> shared_info() const { return shared_info_; }
   Handle<Script> script() const { return script_; }
   void set_script(Handle<Script> script) { script_ = script; }
-  HydrogenCodeStub* code_stub() const {return code_stub_; }
+  CodeStub* code_stub() const { return code_stub_; }
   v8::Extension* extension() const { return extension_; }
   ScriptData** cached_data() const { return cached_data_; }
   ScriptCompiler::CompileOptions compile_options() const {
     return compile_options_;
   }
   ScriptCompiler::ExternalSourceStream* source_stream() const {
     return source_stream_;
   }
   ScriptCompiler::StreamedSource::Encoding source_stream_encoding() const {
     return source_stream_encoding_;
@@ skipping 333 matching lines @@
 
   // Fields filled in by the compilation pipeline.
   // AST filled in by the parser.
   FunctionLiteral* function_;
   // The scope of the function literal as a convenience.  Set to indicate
   // that scopes have been analyzed.
   Scope* scope_;
   // The script scope provided as a convenience.
   Scope* script_scope_;
   // For compiled stubs, the stub object
-  HydrogenCodeStub* code_stub_;
+  CodeStub* code_stub_;
   // The compiled code.
   Handle<Code> code_;
 
   // Possible initial inputs to the compilation process.
   Handle<JSFunction> closure_;
   Handle<SharedFunctionInfo> shared_info_;
   Handle<Script> script_;
   ScriptCompiler::ExternalSourceStream* source_stream_;  // Not owned.
   ScriptCompiler::StreamedSource::Encoding source_stream_encoding_;
 
@@ skipping 288 matching lines @@
   Zone zone_;
   unsigned info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_