Layout descriptor must be trimmed when corresponding descriptors array is trimmed to stay in sync.

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index 286767e34c38828007a54e9d402df337bb0a3ec8..091ea8b5d85af7ed5c5bffda6035b7f25b4d2519 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -2609,6 +2609,13 @@ void MarkCompactCollector::TrimDescriptorArray(Map* map,
 
   if (descriptors->HasEnumCache()) TrimEnumCache(map, descriptors);
   descriptors->Sort();
+
+  if (FLAG_unbox_double_fields) {
+    LayoutDescriptor* layout_descriptor = map->layout_descriptor();
+    layout_descriptor = layout_descriptor->Trim(heap_, map, descriptors,
+                                                number_of_own_descriptors);
+    SLOW_DCHECK(layout_descriptor->IsConsistentWithMap(map, true));
+  }
 }