allow all bits values as type parameters. closes JuliaLang#6081

src/jltypes.c

@@ -1590,7 +1590,7 @@ static int valid_type_param(jl_value_t *v)
     }
     else {
         // TODO: maybe more things
-        return jl_is_type(v) || jl_is_long(v) || jl_is_symbol(v) || jl_is_typevar(v) || jl_is_bool(v);
+        return jl_is_type(v) || jl_is_typevar(v) || jl_is_symbol(v) || jl_isbits(jl_typeof(v));
     }
 }