[Bug target/59396] [avr] Wrong warning with ISR() and -flto

[code at dawg dot eu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59396

--- Comment #5 from Martin Nowak <code at dawg dot eu> ---
(In reply to Georg-Johann Lay from comment #4)
> As the patch above has not been approved, it's unlikely this will ever get
> fixed...

This should have a high priority, it makes LTO completely unusable on AVR.