Move global V8::UseCrankshaft() into the Isolate.

src/factory.cc

 // Copyright 2013 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 646 matching lines @@
     }
     result->set_literals(*literals);
   }
 
   if (index > 0) {
     // Caching of optimized code enabled and optimized code found.
     function_info->InstallFromOptimizedCodeMap(*result, index);
     return result;
   }
 
-  if (V8::UseCrankshaft() &&
+  if (isolate()->use_crankshaft() &&
       FLAG_always_opt &&
       result->is_compiled() &&
       !function_info->is_toplevel() &&
       function_info->allows_lazy_compilation() &&
       !function_info->optimization_disabled() &&
       !isolate()->DebuggerHasBreakPoints()) {
     result->MarkForLazyRecompilation();
   }
   return result;
 }
@@ skipping 940 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal