HeapProfiler: for the test purposes we would like to trace object movements.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index aaa8bc4d0cf2af17292b562712514dd143139f47..5b6c400d7a667c8679b5be792c36748bdef70d28 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -273,11 +273,12 @@ static FixedArrayBase* LeftTrimFixedArray(Heap* heap,
     MemoryChunk::IncrementLiveBytesFromMutator(elms->address(), -size_delta);
   }
 
+  FixedArrayBase* new_elms = FixedArrayBase::cast(HeapObject::FromAddress(
+      elms->address() + size_delta));
   HEAP_PROFILE(heap, ObjectMoveEvent(elms->address(),
-                                     elms->address() + size_delta,
-                                     elms->Size()));
-  return FixedArrayBase::cast(HeapObject::FromAddress(
-      elms->address() + to_trim * entry_size));
+                                     new_elms->address(),
+                                     new_elms->Size()));
+  return new_elms;
 }