[Bug c++/83756] gcc (mingw64) 7.2.0 ICE on boost::call_once

[jacobgodserv at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83756

--- Comment #1 from Jacob Godserv <jacobgodserv at gmail dot com> ---
Obviously you need a way to reproduce this bug. The original comment does not
include that information. I'm going to attach a minimal test case, instructions
on how to run it, and the .ii to make it even easier.