[Bug lto/60319] wrong code (that hangs) by LTO at -Os and above on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60319

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
4.7 and lower is expected to show this behavior due to the bug that c++ is
not properly implemented as c = (char)((int)c + 1) and thus we think that
overflow is undefined.

4.8 and above has that fixed and thus shows different, working behavior.