Replace global static map with an array of pairs (#2691)

* Replace global static map with an array of pairs

\#2687 introduced a global static map, which isn't allowed by
the style guide and caused an issue in DXC.

This change replaces it with an array of pairs.

Signed-off-by: Kévin Petit <kpet@free.fr>

* Replace constexpr with const

Signed-off-by: Kévin Petit <kpet@free.fr>