Improve strictness of Annex B 3.3 for generators and async functions

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 66d7b2307d1084fe4b929707f6e56eea2ff44fab..504511e614d4cbdd9f2d9629258abecb59e87175 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2523,6 +2523,7 @@ EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_string_padding)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(icu_case_mapping)
 #endif
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_async_await)
+EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_restrictive_generators)
 
 void InstallPublicSymbol(Factory* factory, Handle<Context> native_context,
                          const char* name, Handle<Symbol> value) {
@@ -3116,6 +3117,7 @@ bool Genesis::InstallExperimentalNatives() {
 #endif
   static const char* harmony_async_await_natives[] = {
       "native harmony-async-await.js", nullptr};
+  static const char* harmony_restrictive_generators_natives[] = {nullptr};
 
   for (int i = ExperimentalNatives::GetDebuggerCount();
        i < ExperimentalNatives::GetBuiltinsCount(); i++) {