Enable map dependency to in-flight compilation info.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index a07b468300f98756c3afb29d0d0103e72b986f64..99c5b4864d3ed94cb37e5a113994bd35e4559acd 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -2481,11 +2481,12 @@ void MarkCompactCollector::ClearAndDeoptimizeDependentCode(Map* map) {
   int number_of_entries = starts.number_of_entries();
   if (number_of_entries == 0) return;
   for (int i = 0; i < number_of_entries; i++) {
+    if (!entries->is_code_at(i)) continue;
     Code* code = entries->code_at(i);
     if (IsMarked(code) && !code->marked_for_deoptimization()) {
       code->set_marked_for_deoptimization(true);
     }
-    entries->clear_code_at(i);
+    entries->clear_at(i);
   }
   map->set_dependent_code(DependentCode::cast(heap()->empty_fixed_array()));
 }
@@ -2502,14 +2503,15 @@ void MarkCompactCollector::ClearNonLiveDependentCode(Map* map) {
   for (int g = 0; g < DependentCode::kGroupCount; g++) {
     int group_number_of_entries = 0;
     for (int i = starts.at(g); i < starts.at(g + 1); i++) {
+      if (!entries->is_code_at(i)) continue;
       Code* code = entries->code_at(i);
       if (IsMarked(code) && !code->marked_for_deoptimization()) {
         if (new_number_of_entries + group_number_of_entries != i) {
-          entries->set_code_at(new_number_of_entries +
-                               group_number_of_entries, code);
+          entries->set_object_at(
+              new_number_of_entries + group_number_of_entries, code);
         }
-        Object** slot = entries->code_slot_at(new_number_of_entries +
-                                              group_number_of_entries);
+        Object** slot = entries->slot_at(new_number_of_entries +
+                                         group_number_of_entries);
         RecordSlot(slot, slot, code);
         group_number_of_entries++;
       }
@@ -2520,7 +2522,7 @@ void MarkCompactCollector::ClearNonLiveDependentCode(Map* map) {
     new_number_of_entries += group_number_of_entries;
   }
   for (int i = new_number_of_entries; i < number_of_entries; i++) {
-    entries->clear_code_at(i);
+    entries->clear_at(i);
   }
 }