[BUG] type_parameters with mixed unnamed and named positions is not inferrable

[mtfishman]

julia> @code_warntype type_parameters.(Matrix{Float64}, (eltype, 2))
MethodInstance for (::var"##dotfunction#232#1")(::Type{Matrix{Float64}}, ::Tuple{typeof(eltype), Int64})
  from (::var"##dotfunction#232#1")(x1, x2) @ Main none:0
Arguments
  #self#::Core.Const(var"##dotfunction#232#1"())
  x1::Core.Const(Matrix{Float64})
  x2::Tuple{typeof(eltype), Int64}
Body::Tuple{Any, Any}
1 ─ %1 = Base.broadcasted(Main.type_parameters, x1, x2)::Base.Broadcast.Broadcasted{Base.Broadcast.Style{Tuple}, Nothing, typeof(type_parameters), Tuple{Base.RefValue{Type{Matrix{Float64}}}, Tuple{typeof(eltype), Int64}}}
│   %2 = Base.materialize(%1)::Tuple{Any, Any}
└──      return %2