Fix the common error of using underscores instead of dashes.
In the rebranch this is an error (lit got more picky), but it also makes sense to fix the tests in the main branch
`source.request.conformingmethods` is a new SourceKit request which
receives a source position and a list of protocol namses, returns a list
of methods whose return type conforms to the requested protocols.
rdar://problem/44699573