Dear all,

we ICE'd in the simplification of FINDLOC when the passed
ARRAY argument had an invalid declaration.  The reason was
a reference to array->shape which was NULL.

Obvious solution: then just don't attempt to simplify.

Regtested on x86_64-pc-linux-gnu and pushed to mainline as

https://gcc.gnu.org/g:5976fbf9d5dd9542fcb82eebb2185886fd52d000

The PR is marked as a 10/11/12/13 regression, thus I plan to
backport.

Thanks,
Harald