[profiler] Implement POC Sampling Heap Profiler

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 1901 matching lines @@
   bootstrapper_->TearDown();
 
   if (runtime_profiler_ != NULL) {
     delete runtime_profiler_;
     runtime_profiler_ = NULL;
   }
 
   delete basic_block_profiler_;
   basic_block_profiler_ = NULL;
 
+  delete heap_profiler_;
+  heap_profiler_ = NULL;
+
   heap_.TearDown();
   logger_->TearDown();
 
   cancelable_task_manager()->CancelAndWait();
 
-  delete heap_profiler_;
-  heap_profiler_ = NULL;
   delete cpu_profiler_;
   cpu_profiler_ = NULL;
 
   delete root_index_map_;
   root_index_map_ = NULL;
 
   ClearSerializerData();
 }
 
 
@@ skipping 890 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8