Unused functions annotated as `Any`

julia> function foo()
       (1,1)
       end

julia> bar() = (foo(); nothing)

julia> @descend optimize=false bar()
bar() in Main at REPL[7]:1
Variables
  #self#::Core.Const(bar)

│ ─ %-1  = invoke bar()::Core.Const(nothing)
    @ REPL[7]:1 within `bar`
1 ─     Main.foo()::Any
└──     return Main.nothing
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 • %1  = foo()::Any
   ↩

We should either show the type if we have it or add an annotation that the return type was dropped because it is unused.