Correctify instanceof and make it optimizable.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index f6a8014b2ebdbb669da1e0f73c6a43e8600866e6..6835ba0eda909a6ca4600502c598184002d4ff77 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -153,9 +153,8 @@ Callable CodeFactory::StoreGlobalViaContext(Isolate* isolate, int depth,
 
 
 // static
-Callable CodeFactory::Instanceof(Isolate* isolate,
-                                 InstanceofStub::Flags flags) {
-  InstanceofStub stub(isolate, flags);
+Callable CodeFactory::InstanceOf(Isolate* isolate) {
+  InstanceOfStub stub(isolate);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
 }