[turbofan] Add CodeFactory::Instanceof helper.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index fc7ea4aa3625c5491eb9e4fd0562c2ba2887353d..91f51d7d6d398bab734a7798dffddecc5c765d7a 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -110,6 +110,14 @@ Callable CodeFactory::BinaryOpIC(Isolate* isolate, Token::Value op,
 
 
 // static
+Callable CodeFactory::Instanceof(Isolate* isolate,
+                                 InstanceofStub::Flags flags) {
+  InstanceofStub stub(isolate, flags);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+
+// static
 Callable CodeFactory::ToBoolean(Isolate* isolate,
                                 ToBooleanStub::ResultMode mode,
                                 ToBooleanStub::Types types) {