Use elixir_errors:form_warn/4 when possible in elixir_clauses (#7520)
Use elixir_errors:form_warn/4 when possible in elixir_clauses (#7520)


pedrosnk/elixir,pedrosnk/elixir,ggcampinho/elixir,kelvinst/elixir,lexmag/elixir,kelvinst/elixir,elixir-lang/elixir,joshprice/elixir,michalmuskala/elixir,kimshrier/elixir,kimshrier/elixir,ggcampinho/elixir,lexmag/elixir