Run Crankshaft on a separate thread.

src/d8.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 1529 matching lines @@
         options.stress_opt ? Testing::kStressTypeOpt
                            : Testing::kStressTypeDeopt);
     int stress_runs = Testing::GetStressRuns();
     for (int i = 0; i < stress_runs && result == 0; i++) {
       printf("============ Stress %d/%d ============\n", i + 1, stress_runs);
       Testing::PrepareStressRun(i);
       options.last_run = (i == stress_runs - 1);
       result = RunMain(argc, argv);
     }
     printf("======== Full Deoptimization =======\n");
+    Locker lock;
     Testing::DeoptimizeAll();
 #if !defined(V8_SHARED)
   } else if (i::FLAG_stress_runs > 0) {
     int stress_runs = i::FLAG_stress_runs;
     for (int i = 0; i < stress_runs && result == 0; i++) {
       printf("============ Run %d/%d ============\n", i + 1, stress_runs);
       options.last_run = (i == stress_runs - 1);
       result = RunMain(argc, argv);
     }
 #endif
@@ skipping 35 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif