P3218 R0 const references to constexpr variables

[wg21bot]

P3218R0 const references to constexpr variables (Jarrad J Waterloo)

[jensmaurer]

EWG first, then CWG (when/if approved).

[hanickadot]

P3218R0: EWGI encourages further work on this paper as currently is.

SF	F	N	A	SA
1	1	0	6	3

Result: no consensus

P3218R0: EWGI encourages further work on "consteval" constructors.

SF	F	N	A	SA
3	3	4	2	0

Result: Consensus