[Bug middle-end/38474] compile time explosion in dataflow_set_preserve_mem_locs at -O3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38474

--- Comment #102 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
At -O2 -g add_stack_var_conflict looks to be high up. Which might mean this
introduced recently by me.