Track JS allocations as they arrive with no affection on performance when tracking is switched off

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index daa5a4a5bdad825e7d73fc42531df9e23ac848b6..95d9c83b5179ce4002fa0b3818e8d535ae795c20 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -2312,6 +2312,13 @@ static void RightTrimFixedArray(Heap* heap, FixedArray* elms, int to_trim) {
       MemoryChunk::IncrementLiveBytesFromMutator(elms->address(), -size_delta);
     }
   }
+
+  // This repeating record is necessary because the array may not be moved
+  // during GC, and size has to be adjusted nevetheless.
+  HeapProfiler* profiler = heap->isolate()->heap_profiler();
+  if (profiler->is_tracking_allocations()) {
+    profiler->NewObjectEvent(elms->address(), elms->Size());
+  }
 }