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 b91134bc34be9aeb75d4fff477adcd902787379e..c76aa111d587ce41f544201edaa2ed1dfeddfe89 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -2229,6 +2229,13 @@ static void RightTrimFixedArray(Heap* heap, FixedArray* elms, int to_trim) {
       MemoryChunk::IncrementLiveBytesFromMutator(elms->address(), -size_delta);
     }
   }
+
+  // The array may not be moved during GC,
+  // and size has to be adjusted nevertheless.
+  HeapProfiler* profiler = heap->isolate()->heap_profiler();
+  if (profiler->is_tracking_allocations()) {
+    profiler->UpdateObjectSizeEvent(elms->address(), elms->Size());
+  }
 }