[Bug rtl-optimization/104985] [12 Regression] ICE: SIGSEGV in undo_to_marker / adjust_reg_mode with -Os -frounding-math since r12-4767-g81342e95827f77

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104985

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 52697
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52697&action=edit
gcc12-pr104985-3.patch

And 3rd untested version, keep SUBST_MODE users as they are, but change
SUBST_MODE implementation and UNDO_MODE users.