added testcase for linearization with HOAS

testsuite/runtime/linearize/TestCnc.gf

@@ -0,0 +1,7 @@
+concrete TestCnc of Test = {
+
+lincat E,P = {s:Str} ;
+
+lin Exist f = {s = "exists" ++ f.$0 ++ "such that" ++ f.s};
+lin Even x  = {s = x.s ++ "is even"};
+}