[Bug middle-end/89690] ICE on a MEM_REF in trivial gimple

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89690

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Shouldn't the GIMPLE front-end give a better error message for invalid input? 
I realize -fgimple is an experimental feature but it seems that we should at
least aim for the same robust error handling in the front-end as everywhere
else.