[perl #124496] Roast rakudo skip/todo test:./S02-types/mix.t line:418 reason: 'we have not secured .WHICH creation yet'

[Aleks-Daniel Jakimenko-Aleksejev via RT]

Untodoed in
https://github.com/perl6/roast/commit/e9f0893dc39450be68a0550c451ad1eca7e6f3ab