[Bug tree-optimization/85788] False positive of -Wstringop-overflow= warning

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85788

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 44137
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44137&action=edit
original test-case

On trunk disappeared in r259672. I'm attaching original test-case which
reproduces on trunk as well.