[Bug target/67281] HTM builtins aren't treated as compiler barriers on powerpc

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67281

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Since there are no stores, the load seems like it can be pulled out of the loop
too.