Do deferred migration of maps after deoptimizing once.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 2e8c0ada3877b3633e34c5f4d9732c94868de3c2..ef41a4b612259fabb2b69997f6cbe1b8a4afbe24 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4287,6 +4287,16 @@ uint32_t Map::bit_field3() {
 }
 
 
+void Map::set_has_migrated(bool value) {
+  set_bit_field3(HasMigrated::update(bit_field3(), value));
+}
+
+
+bool Map::has_migrated() {
+  return HasMigrated::decode(bit_field3());
+}
+
+
 void Map::ClearTransitions(Heap* heap, WriteBarrierMode mode) {
   Object* back_pointer = GetBackPointer();