[2024-11 LWG Motion 14] P3508R0 Wording for "constexpr for specialized memory algorithms" and P3369R0 constexpr for uninitialized_default_construct

[P3508R0](https://wiki.edg.com/pub/Wg21wroclaw2024/StrawPolls/p3508r0.html) (Wording for "constexpr for specialized memory algorithms") and [P3369R0](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p3369r0.html) (constexpr for uninitialized_default_construct)