[PATCH, libstdc++] Implement C++20 p1032 default_searcher constexprosity.

[Jonathan Wakely]

On 15/11/19 20:15 +0000, Smith-Rowland, Edward M wrote:
>--- testsuite/20_util/function_objects/constexpr_searcher.cc	(nonexistent)
>+++ testsuite/20_util/function_objects/constexpr_searcher.cc	(working copy)
>@@ -0,0 +1,52 @@
>+// Copyright (C) 2014-2019 Free Software Foundation, Inc.

Just 2019 here, OK for trunk with that change. Thanks!