Make sure only toStringTag is used for Object.prototype.toString with JSON / Math

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 328ff63cd9d9059d22394e56a56e9a52eeb18ff4..401cbdbacc0d9a0dcb1a87e41c8273e9571d5202 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1589,7 +1589,6 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
     Handle<JSFunction> cons = factory->NewFunction(name);
     JSFunction::SetInstancePrototype(cons,
         Handle<Object>(native_context()->initial_object_prototype(), isolate));
-    cons->shared()->set_instance_class_name(*name);
     Handle<JSObject> json_object = factory->NewJSObject(cons, TENURED);
     DCHECK(json_object->IsJSObject());
     JSObject::AddProperty(global, name, json_object, DONT_ENUM);
@@ -1601,7 +1600,6 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
     JSFunction::SetInstancePrototype(
         cons,
         Handle<Object>(native_context()->initial_object_prototype(), isolate));
-    cons->shared()->set_instance_class_name(*name);
     Handle<JSObject> math = factory->NewJSObject(cons, TENURED);
     DCHECK(math->IsJSObject());
     JSObject::AddProperty(global, name, math, DONT_ENUM);