[Bug target/126293] Add x86-64 option to turn on 128-bit inline atomic loads/stores

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126293

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 65072
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65072&action=edit
The initial patch to add -m128bit-atomic