Move flow graph and helper classes to their own file.

src/compiler.cc

 // Copyright 2010 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 16 matching lines @@
 
 #include "v8.h"
 
 #include "bootstrapper.h"
 #include "codegen-inl.h"
 #include "compilation-cache.h"
 #include "compiler.h"
 #include "data-flow.h"
 #include "debug.h"
 #include "fast-codegen.h"
+#include "flow-graph.h"
 #include "full-codegen.h"
 #include "liveedit.h"
 #include "oprofile-agent.h"
 #include "rewriter.h"
 #include "scopes.h"
 
 namespace v8 {
 namespace internal {
 
 
@@ skipping 606 matching lines @@
       LOG(CodeCreateEvent(tag, *code, *func_name));
       OProfileAgent::CreateNativeCodeRegion(*func_name,
                                             code->instruction_start(),
                                             code->instruction_size());
     }
   }
 }
 #endif
 
 } }  // namespace v8::internal