[Bug c++/58542] std::atomic<__int128_t>::store broken with -march=corei7

[2013.bugzilla.gcc.gnu.org at ingomueller dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58542

--- Comment #1 from Ingo Müller <2013.bugzilla.gcc.gnu.org at ingomueller dot 
net> ---
Created attachment 30901
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30901&action=edit
Minimal "working" example of how std::atomic<__int128_t>::store can break.