[Bug c++/92343] [[likely]]/[[unlikely]] prevent method from being a constant expression

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92343

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47164
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47164&action=edit
gcc10-pr92343.patch

Untested fix.