[Bug target/70359] [6/7/8 Regression] Code size increase for ARM compared to gcc-5.3.0

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70359

--- Comment #26 from Richard Biener <rguenth at gcc dot gnu.org> ---
So I suggest to look at insert_backedge_copies () to see whether replacing
out-of-loop pre-inc uses with the post-inc value is possible.