[Bug tree-optimization/93321] Unlimited recursion in prepare_block_for_update

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93321

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note prepare_block_for_update  has been this way since 2005 with
g:0bca51f080dfff5e943b1f1775d874a73bbc441a