disallow left-trim fast path when sampling heap profiler is active

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 5c2d5786099bff15cd894eea21f08693bd4dc0cf..c7956a3d5dad46a3efac69cb8b0b432c2576deeb 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -3090,6 +3090,9 @@ void Heap::CreateFillerObjectAt(Address addr, int size,
 bool Heap::CanMoveObjectStart(HeapObject* object) {
   if (!FLAG_move_object_start) return false;
 
+  // Sampling heap profiler may have a reference to the object.
+  if (isolate()->heap_profiler()->is_sampling_allocations()) return false;
+
   Address address = object->address();
 
   if (lo_space()->Contains(object)) return false;