[Bug c/61240] [4.8/4.9/4.10 Regression] Incorrect warning "integer overflow in expression" on pointer-pointer subtraction

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61240

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
But in that case we should have an adequate replacement on the
match_and_simplify side.