SmallVectorImpl<Value>* inputs, NamedAttrList* arg_attrs,
      llvm::StringMap<Attribute>* derived_attrs) const;

  // Uses the collected attribute values to derive all the output types.
  LogicalResult DeriveOutputTypes(Location loc, FunctionType signature,
                                  const llvm::StringMap<Attribute>& attrs,
                                  SmallVectorImpl<Type>* output_types) const;