Disable classes in sloppy mode unless --harmony-sloppy is set

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 03dd5692148db0080a4b19315a6ae8c80236e19d..ec1d6d22cac7276c5a04868b820ace0f6f6b0593 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1598,6 +1598,7 @@ EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_arrow_functions)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_numeric_literals)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_tostring)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_templates)
+EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_sloppy)
 
 
 void Genesis::InstallNativeFunctions_harmony_proxies() {
@@ -1625,6 +1626,7 @@ EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_numeric_literals)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_tostring)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_proxies)
 EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_templates)
+EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_sloppy)
 
 void Genesis::InitializeGlobal_harmony_regexps() {
   Handle<JSObject> builtins(native_context()->builtins());
@@ -2180,6 +2182,7 @@ bool Genesis::InstallExperimentalNatives() {
                                                    NULL};
   static const char* harmony_templates_natives[] = {
       "native harmony-templates.js", NULL};
+  static const char* harmony_sloppy_natives[] = {NULL};
 
   for (int i = ExperimentalNatives::GetDebuggerCount();
        i < ExperimentalNatives::GetBuiltinsCount(); i++) {