--- a/lib/Target/AVR/AVR.h	Sat Feb 17 09:57:20 2018 +0900
+++ b/lib/Target/AVR/AVR.h	Wed Aug 14 16:55:33 2019 +0900
@@ -1,9 +1,8 @@
 //===-- AVR.h - Top-level interface for AVR representation ------*- C++ -*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -37,8 +36,10 @@
 /// Contains the AVR backend.
 namespace AVR {
 
+/// An integer that identifies all of the supported AVR address spaces.
 enum AddressSpace { DataMemory, ProgramMemory };
 
+/// Checks if a given type is a pointer to program memory.
 template <typename T> bool isProgramMemoryAddress(T *V) {
   return cast<PointerType>(V->getType())->getAddressSpace() == ProgramMemory;
 }