Run Crankshaft on a separate thread.

src/factory.cc

 // Copyright 2012 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 550 matching lines @@
                     context->global_context());
     }
     result->set_literals(*literals);
   }
   if (V8::UseCrankshaft() &&
       FLAG_always_opt &&
       result->is_compiled() &&
       !function_info->is_toplevel() &&
       function_info->allows_lazy_compilation() &&
       !function_info->optimization_disabled()) {
-    result->MarkForLazyRecompilation();
+    if (FLAG_concurrent_crankshaft)
+      result->CompileConcurrently();
+    else
+      result->MarkForLazyRecompilation();
   }
   return result;
 }
 
 
 Handle<Object> Factory::NewNumber(double value,
                                   PretenureFlag pretenure) {
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->NumberFromDouble(value, pretenure), Object);
@@ skipping 858 matching lines @@
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return Handle<Object>(value
                         ? isolate()->heap()->true_value()
                         : isolate()->heap()->false_value());
 }
 
 
 } }  // namespace v8::internal