[clang] [clang] Allow constexpr-unknown values pre C++23 (PR #129646)

[Eli Friedman via cfe-commits]

Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/129646 at github.com>


efriedma-quic wrote:

The other test changes look mostly okay, but worth investigating to see if we can improve the diagnostic notes for illegal uses of constexpr-unknown variables.

https://github.com/llvm/llvm-project/pull/129646