No need to start Ticker for Crankshaft

src/isolate.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 1792 matching lines @@
       for (int i = 0; i < FLAG_marking_threads; i++) {
         marking_thread_[i]->Stop();
         delete marking_thread_[i];
       }
       delete[] marking_thread_;
     }
 
     if (FLAG_hydrogen_stats) GetHStatistics()->Print();
 
     // We must stop the logger before we tear down other components.
-    logger_->EnsureTickerStopped();
+    Sampler* sampler = logger_->sampler();
+    if (sampler && sampler->IsActive()) sampler->Stop();
 
     delete deoptimizer_data_;
     deoptimizer_data_ = NULL;
     if (FLAG_preemption) {
       v8::Locker locker(reinterpret_cast<v8::Isolate*>(this));
       v8::Locker::StopPreemption();
     }
     builtins_.TearDown();
     bootstrapper_->TearDown();
 
@@ skipping 561 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal