[Bug c++/105233] Incorrect "alignment not an integer constant" error in alignas with template parameter dependent argument

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105233

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 52791
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52791&action=edit
gcc12-pr105233.patch

Untested patch that makes alignas and aligned attribute argument manifestly
constant evaluated expression.