HeapProfiler doesn't track array movements when it is shifting.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index bd32fe280e3a7651e96b374cc90f1f1605e4bc7d..0f493e6e5712558237a4b3dbdd4edb541b54b7f1 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -33,6 +33,7 @@
 #include "builtins.h"
 #include "gdb-jit.h"
 #include "ic-inl.h"
+#include "heap-profiler.h"
 #include "mark-compact.h"
 #include "vm-state-inl.h"
 
@@ -380,6 +381,8 @@ static FixedArray* LeftTrimFixedArray(Heap* heap,
     MemoryChunk::IncrementLiveBytesFromMutator(elms->address(), -size_delta);
   }
 
+  HEAP_PROFILE(heap, ObjectMoveEvent(elms->address(),
+                                     elms->address() + size_delta));
   return FixedArray::cast(HeapObject::FromAddress(
       elms->address() + to_trim * kPointerSize));
 }