[Bug rtl-optimization/78883] [avr] ICE triggered by change to combine.c (r243578)

[vogt at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78883

--- Comment #4 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
A discussion of the problem starts here:
https://gcc.gnu.org/ml/gcc-patches/2016-12/msg01776.html
(Looks like a reload problem)