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

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philnik777 wrote:

> This looks like a good motivation for both [Exposing the diagnostic engine to C++](https://discourse.llvm.org/t/exposing-the-diagnostic-engine-to-c/73092) (LLVM) and [P2758 Emitting messages at compile time](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2758r0.html).

I'm not sure how that would help. The problem here is that we have to detect whether the string is promoted to static storage, which AFAIK isn't possible to detect in this case. 

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