Revert "Never use classic code generator."

src/v8.cc

-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2006-2009 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
 //       with the distribution.
@@ skipping 177 matching lines @@
   ScopedLock lock(init_once_mutex);
   if (init_once_called) return;
   init_once_called = true;
 
   // Setup the platform OS support.
   OS::Setup();
 
 #if defined(V8_TARGET_ARCH_ARM) && !defined(USE_ARM_EABI)
   use_crankshaft_ = false;
 #else
-  use_crankshaft_ = true;
+  use_crankshaft_ = FLAG_crankshaft;
 #endif
 
   if (Serializer::enabled()) {
     use_crankshaft_ = false;
   }
 
   CPU::Setup();
   if (!CPU::SupportsCrankshaft()) {
     use_crankshaft_ = false;
   }
 
   // Peephole optimization might interfere with deoptimization.
   FLAG_peephole_optimization = !use_crankshaft_;
 }
 
 } }  // namespace v8::internal