[Bug tree-optimization/93454] [10 Regression] buffer overflow in fold_array_ctor_reference since r10-1882

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93454

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47715
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47715&action=edit
gcc10-pr93454.patch

Untested fix.