[Bug rtl-optimization/57448] GCSE generates incorrect code with acquire barrier

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57448

--- Comment #2 from Steven Bosscher <steven at gcc dot gnu.org> ---
Created attachment 30219
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30219&action=edit
Handle ALIAS_SET_MEMORY_BARRIER loads and stores

It feels like too-big-a-hammer but I don't see any other way...