[libc++][test] Remove support old compiler support.

[Mordante]

Summary

The compilers clang-11, clang-12, and apple-clang-12 are no longer
supported, so remove their annotations in the tests.

[philnik]

Assuming you've grepped for them and there aren't any more this LGTM with CI passing.

[Mordante]

In D127588#3576113, @philnik wrote:

Assuming you've grepped for them and there aren't any more this LGTM with CI passing.

Correct, thanks for the review!

libcxx/test/std/ranges/range.adaptors/range.filter/pred.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
 
 // Older Clangs don't properly deduce decltype(auto) with a concept constraint
-// XFAIL: clang-11, clang-12
-// XFAIL: apple-clang-12, apple-clang-13.0
+// XFAIL: apple-clang-13.0
 
 // constexpr Pred const& pred() const;
 
 #include <ranges>
 
 #include <cassert>
 #include <concepts>
 

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.char_array.pass.cpp

 //===----------------------------------------------------------------------===//
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 // TODO FMT Evaluate gcc-11 status
 // UNSUPPORTED: gcc-11
-// UNSUPPORTED: apple-clang-12
 
 // <format>
 
 // [format.functions]/25
 //   Preconditions: formatter<remove_cvref_t<Ti>, charT> meets the
 //   BasicFormatter requirements ([formatter.requirements]) for each Ti in
 //   Args.