[Bug other/68500] Remove in_loop_pipeline usage

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68500

--- Comment #1 from vries at gcc dot gnu.org ---
Created attachment 36808
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36808&action=edit
Tentative patch: "Don't reapply loops flags if unnecessary in
loop_optimizer_init"