Do deferred migration of maps after deoptimizing once.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 80773bf14789e8524dc4c46184588641d6396495..428cb78f241d64f968ea04743895600dea774dde 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2689,7 +2689,9 @@ class HCheckMaps V8_FINAL : public HTemplateInstruction<2> {
  private:
   void Add(Handle<Map> map, Zone* zone) {
     map_set_.Add(Unique<Map>(map), zone);
-    if (!has_migration_target_ && map->is_migration_target()) {
+    if (!has_migration_target_ &&
+        map->is_migration_target() &&
+        map->has_migrated()) {
       has_migration_target_ = true;
       SetGVNFlag(kChangesNewSpacePromotion);
     }