[Bug target/100758] __builtin_cpu_supports does not (always) detect "sse2"

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100758

--- Comment #22 from Martin Liška <marxin at gcc dot gnu.org> ---
Thank you Jakub, please revert my documentation patch if you are convinced
enough the change works only on old VIA CPUs.