[Bug other/124437] {add,sub,mul}v3 patterns not documented

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124437

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
r0-31006-g91ce572a07eddf