Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
diff --git a/clang-tools-extra/change-namespace/tool/ClangChangeNamespace.cpp b/clang-tools-extra/change-namespace/tool/ClangChangeNamespace.cpp
index 180e8c3..0d51502 100644
--- a/clang-tools-extra/change-namespace/tool/ClangChangeNamespace.cpp
+++ b/clang-tools-extra/change-namespace/tool/ClangChangeNamespace.cpp
@@ -1,9 +1,8 @@
 //===-- ClangIncludeFixer.cpp - Standalone change namespace ---------------===//
 //
-//                     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
 //
 //===----------------------------------------------------------------------===//
 // This tool can be used to change the surrounding namespaces of class/function