[turbofan] Add CodeFactory::Instanceof helper.

src/code-factory.h

Index: src/code-factory.h
diff --git a/src/code-factory.h b/src/code-factory.h
index e26fc092fa6e647ce59faf70cd2c86a534b70e23..b473abe6741bfd897a87f315476aa1067631ff06 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -56,6 +56,8 @@ class CodeFactory final {
 
   // Code stubs. Add methods here as needed to reduce dependency on
   // code-stubs.h.
+  static Callable Instanceof(Isolate* isolate, InstanceofStub::Flags flags);
+
   static Callable ToBoolean(
       Isolate* isolate, ToBooleanStub::ResultMode mode,
       ToBooleanStub::Types types = ToBooleanStub::Types());