[Bug target/94373] 548.exchange2_r run time is 7-12% worse than GCC 9 at -O2 and generic march/mtune

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94373

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
I think
Change lea_cost from 2 --> 1 in skylake can fix this regressions.

Since it's stage4 now, i hold my patch.