[clang] [libcxx] Allow string to use SSO in constant evaluation. (PR #66576)

[via cfe-commits]

================
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// Ensure that strings which fit within the SSO size can be constant-initialized
+// globals.  (this is permitted but not required to work by the standard).
----------------
philnik777 wrote:

```suggestion
// globals.
```
No need to state that. If it was required by the standard, this test wouldn't be libc++-specific.

https://github.com/llvm/llvm-project/pull/66576