[profiler] sampled allocations should be marked as independent

src/profiler/sampling-heap-profiler.cc

 // Copyright 2015 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/profiler/sampling-heap-profiler.h"
 
 #include <stdint.h>
 #include <memory>
 #include "src/api.h"
 #include "src/base/utils/random-number-generator.h"
@@ skipping 91 matching lines @@
   heap()->CreateFillerObjectAt(soon_object, static_cast<int>(size),
                                ClearRecordedSlots::kNo);
 
   Local<v8::Value> loc = v8::Utils::ToLocal(obj);
 
   AllocationNode* node = AddStack();
   node->allocations_[size]++;
   Sample* sample = new Sample(size, node, loc, this);
   samples_.insert(sample);
   sample->global.SetWeak(sample, OnWeakCallback, WeakCallbackType::kParameter);
+  sample->global.MarkIndependent();
 }
 
 void SamplingHeapProfiler::OnWeakCallback(
     const WeakCallbackInfo<Sample>& data) {
   Sample* sample = data.GetParameter();
   AllocationNode* node = sample->owner;
   DCHECK(node->allocations_[sample->size] > 0);
   node->allocations_[sample->size]--;
   if (node->allocations_[sample->size] == 0) {
     node->allocations_.erase(sample->size);
@@ skipping 144 matching lines @@
     }
   }
   auto profile = new v8::internal::AllocationProfile();
   TranslateAllocationNode(profile, &profile_root_, scripts);
   return profile;
 }
 
 
 }  // namespace internal
 }  // namespace v8