[Bug target/80232] Ofast pessimizes Sparse matmult in scimark2 benchmark on avx platforms

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80232

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
I've adjusted the generic cost model for gather/scatter for GCC 8 (doesn't help
here).