[Bug c/69522] [4.9/5/6 Regression] gcc hangs on valid code on x86_64-linux-gnu

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69522

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
More archeology: an ICE started with (probably) r191706, and went away with
r206957.