[2026-03 LWG Motion 4] P3844R4 Reword [simd.math] for consteval conversions

[jensmaurer]

P3844R4 (Reword [simd.math] for consteval conversions)

[mattkretz]

I started merging my paper's LaTeX into the draft. It'll take a while until I have a PR. The diff is large.