[parser] Lift template literal invalid escape restriction

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 5bff6491996e539c880a85e29989762e6dbfa629..b69214305ba078fe0d9efafc1909451f417d423c 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -3531,6 +3531,7 @@ EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_trailing_commas)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_class_fields)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_object_rest_spread)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_dynamic_import)
+EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_template_escapes)
 
 void InstallPublicSymbol(Factory* factory, Handle<Context> native_context,
                          const char* name, Handle<Symbol> value) {
@@ -4124,6 +4125,7 @@ bool Genesis::InstallExperimentalNatives() {
   static const char* harmony_object_rest_spread_natives[] = {nullptr};
   static const char* harmony_async_iteration_natives[] = {nullptr};
   static const char* harmony_dynamic_import_natives[] = {nullptr};
+  static const char* harmony_template_escapes_natives[] = {nullptr};
 
   for (int i = ExperimentalNatives::GetDebuggerCount();
        i < ExperimentalNatives::GetBuiltinsCount(); i++) {