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.

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/demangle/DemangleConfig.h b/src/demangle/DemangleConfig.h
index 3be1ccd..be3ea59 100644
--- a/src/demangle/DemangleConfig.h
+++ b/src/demangle/DemangleConfig.h
@@ -1,9 +1,8 @@
 //===--- Compiler.h ---------------------------------------------*- 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
 //
 // This file is contains a subset of macros copied from
 // llvm/lib/Demangle/Compiler.h.
diff --git a/src/demangle/StringView.h b/src/demangle/StringView.h
index 9af4e06..ceb6c79 100644
--- a/src/demangle/StringView.h
+++ b/src/demangle/StringView.h
@@ -1,9 +1,8 @@
 //===--- StringView.h -------------------------------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 //
diff --git a/src/demangle/Utility.h b/src/demangle/Utility.h
index 4d44cd8..ec23859 100644
--- a/src/demangle/Utility.h
+++ b/src/demangle/Utility.h
@@ -1,9 +1,8 @@
 //===--- Utility.h ----------------------------------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 //
diff --git a/test/testit b/test/testit
index a41b691..eca0b37 100755
--- a/test/testit
+++ b/test/testit
@@ -1,10 +1,9 @@
 #!/bin/sh
 #===------------------------------ testit ----------------------------------===#
 #
-#                     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
 #
 #===------------------------------------------------------------------------===#