bug#51092: [PATCH] Recognize consteval and constinit modifiers in C++

[Lars Ingebrigtsen]

Evan Klitzke <evan@eklitzke.org> writes:

> These two modifiers were introduced by C++20. The change is trivial
> but I tested it locally on some code I have that uses these modifiers
> and with this change the keywords are recognized as expected. I agree
> to copyright assignment to the FSF, etc. Patch against master is
> attached; I think this should be backported to the emacs-28 branch as
> well.

[...]

> -  c++  (append '("constexpr" "explicit" "friend" "mutable" "template"
> -              "thread_local" "virtual")
> +  c++  (append '("consteval" "constexpr" "constinit" "explicit"
> +              "friend" "mutable" "template" "thread_local" "virtual")

Makes sense to me; perhaps Alan has some comments, so I've added him to
the CCs.

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