Add Compat for TypeUtils

See JuliaLang/julia#20006

Author: Keno

src/Compat.jl

@@ -1698,4 +1698,14 @@ if VERSION < v"0.6.0-dev.1256"
     Base.take!(io::Base.AbstractIOBuffer) = takebuf_array(io)
 end
 
-end # module
+module TypeUtils
+    @static if isdefined(Core, :UnionAll)
+        using Base: isabstract, parameter_upper_bound, unparameterized_type
+    else
+        isabstract(t::DataType) = t.abstract
+        parameter_upper_bound(t::DataType, idx) = t.parameters[idx].ub
+        unparameterized_type(t::DataType) = t.name.primary
+    end
+    export isabstract, parameter_upper_bound, unparameterized_type
+end # module TypeUtils
+end # module Compat