[libc++][test] Add license headers to test/support/archetypes.*

[CaseyCarter]

Summary

These two files (archetypes.h and archetypes.ipp) are missing license headers.

libcxx/test/support/archetypes.h

+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
 #ifndef TEST_SUPPORT_ARCHETYPES_H
 #define TEST_SUPPORT_ARCHETYPES_H
 
 #include <type_traits>
 #include <cassert>
 
 #include "test_macros.h"
 #include "test_workarounds.h"

libcxx/test/support/archetypes.ipp

+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef DEFINE_BASE
 #define DEFINE_BASE(Name) ::ArchetypeBases::NullBase
 #endif
 #ifndef DEFINE_EXPLICIT
 #define DEFINE_EXPLICIT
 #endif
 #ifndef DEFINE_NOEXCEPT