Correctify instanceof and make it optimizable.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index bec199e0e399f7ce34cd25516f89f9d7d93f2396..0c20ea067c489139844695562efbc89ee3238a83 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -443,10 +443,7 @@ void JSGenericLowering::LowerJSHasProperty(Node* node) {
 
 void JSGenericLowering::LowerJSInstanceOf(Node* node) {
   CallDescriptor::Flags flags = AdjustFrameStatesForCall(node);
-  InstanceofStub::Flags stub_flags = static_cast<InstanceofStub::Flags>(
-      InstanceofStub::kReturnTrueFalseObject |
-      InstanceofStub::kArgsInRegisters);
-  Callable callable = CodeFactory::Instanceof(isolate(), stub_flags);
+  Callable callable = CodeFactory::InstanceOf(isolate());
   ReplaceWithStubCall(node, callable, flags);
 }