Guard the property RegExp.prototype.unicode behind --harmony-regexp-unicode

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 34494122096da30dfc5919d15e74e71547e42136..83d265e9421a8d357e81e8b91e63ceeece4efbd0 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2662,7 +2662,8 @@ bool Genesis::InstallExperimentalNatives() {
   static const char* harmony_sloppy_natives[] = {nullptr};
   static const char* harmony_sloppy_function_natives[] = {nullptr};
   static const char* harmony_sloppy_let_natives[] = {nullptr};
-  static const char* harmony_unicode_regexps_natives[] = {nullptr};
+  static const char* harmony_unicode_regexps_natives[] = {
+      "native harmony-unicode-regexps.js", nullptr};
   static const char* harmony_default_parameters_natives[] = {nullptr};
   static const char* harmony_reflect_natives[] = {"native harmony-reflect.js",
                                                   nullptr};