[Bug tree-optimization/68622] initialization of atomic objects emits unnecessary fences

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68622

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
http://llvm.org/devmtg/2014-10/Slides/Morisset-AtomicsPresentation.pdf