Return descriptor ownership after TrimDescriptorArray to allow resharing of descriptor arrays

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 530fb6d804d5d7eb5a4bccd380eaa40b60733ff3..78441de17c209061c476767226536fb66714f48f 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9306,6 +9306,7 @@ void Map::ClearNonLiveTransitions(Heap* heap) {
     if (number_of_own_descriptors > 0) {
       TrimDescriptorArray(heap, this, descriptors, number_of_own_descriptors);
       ASSERT(descriptors->number_of_descriptors() == number_of_own_descriptors);
+      map->set_owns_descriptors(true);
     } else {
       ASSERT(descriptors == GetHeap()->empty_descriptor_array());
     }