[Bug target/120815] Update -mtune=intel for Diamond Rapids and Clearwater Forest

[liuhongt at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120815

--- Comment #2 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
Maybe we should have something like mtune=intel_p and mtune=intel_e, P-core and
E-core are quite different from each other, mtune=intel maybe not sufficient.