Proposal: allow `if consteval`

[Victor Vianna]

Here is a snippet that shows why this feature is useful (TIL).

And here is a CL to allow it and add some usages - mostly to verify the feature works and make the code more concise, since it is not particularly useful in those instances IIUC.

-- Victor

[Jeremy Roman]

Makes sense to me. We don't use consteval much yet, so it's kinda neutral until we do, but might as well allow it and maybe it'll become increasingly useful.

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[Elly]

I'm also fine with this, although I can't say I've ever wished for consteval personally.

-- elly

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[Jan Wilken Dörrie]

+1. This removes a bit gotcha with std::is_constant_evaluated(), which needs to be used with a runtime if (rather than constexpr if) to be meaningful: https://en.cppreference.com/w/cpp/types/is_constant_evaluated.html#Notes