fix missing methods in ml_matches results (#50962)
This was resulting in it being too aggressive at filtering out
"duplicate" results, resulting in possible inference mistakes or missing
guardsig entries.
Fixes:
https://github.com/JuliaLang/julia/pull/50722#issuecomment-1658995284
(cherry picked from commit 762801cb537657f169c993edbef61751e3a51f7f)
