[Bug target/66960] Add interrupt attribute to x86 backend

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66960

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 38653
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38653&action=edit
A patch

Please try this.