[Bug tree-optimization/122153] cselim and cselim-limited should be able to handle `= {}`

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122153

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 62498
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62498&action=edit
patch which I am testing