[NFC] Fix license header from D87841

llvm/include/llvm/Frontend/OpenMP/OMPGridValues.h

@@ -1,9 +1,8 @@
 //====--- OMPGridValues.h - Language-specific address spaces --*- 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
 //
 //===----------------------------------------------------------------------===//
 ///