[Bug other/68498] Replace LOOPS_MAY_HAVE_MULTIPLE_LATCHES with LOOPS_HAVE_SINGLE_LATCH

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68498

--- Comment #2 from vries at gcc dot gnu.org ---
Created attachment 36825
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36825&action=edit
Tentative patch