[ VM ] Updated splay-tree licenses, added V8 project authors to AUTHORS

Change-Id: I02e38f3b80617d0d4ddf398cb94e8ee027d68e0c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/100889
Reviewed-by: Zach Anderson <zra@google.com>

AUTHORS

@@ -4,6 +4,7 @@
 #   Name/Organization <email address>
 
 Google Inc.
+The V8 project authors
 
 Ola Martin Bini <ola.bini@gmail.com>
 Michael Haubenwallner <michael.haubenwallner@gmail.com>

runtime/platform/splay-tree-inl.h

@@ -1,8 +1,6 @@
-// Copyright (c) 2019, the Dart project authors.
-// Copyright 2010 the V8 project authors.
-// Please see the AUTHORS file for details. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
+// Copyright (c) 2010, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
 //
 // The original file can be found at:
 // https://github.com/v8/v8/blob/master/src/splay-tree-inl.h

runtime/platform/splay-tree.h

@@ -1,8 +1,6 @@
-// Copyright (c) 2019, the Dart project authors.
-// Copyright 2010 the V8 project authors.
-// Please see the AUTHORS file for details. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
+// Copyright (c) 2010, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
 //
 // The original file can be found at:
 // https://github.com/v8/v8/blob/master/src/splay-tree.h