Sort tests.

test/libsolidity/semanticTests/reverts/invalid_enum_compared.sol

@@ -0,0 +1,29 @@
+contract C {
+    enum X {A, B}
+
+    function test_eq() public returns (bool) {
+        X garbled;
+        assembly {
+            garbled := 5
+        }
+        return garbled == garbled;
+    }
+
+    function test_eq_ok() public returns (bool) {
+        X garbled = X.A;
+        return garbled == garbled;
+    }
+
+    function test_neq() public returns (bool) {
+        X garbled;
+        assembly {
+            garbled := 5
+        }
+        return garbled != garbled;
+    }
+}
+
+// ----
+// test_eq_ok() -> 1
+// test_eq() -> FAILURE # both should throw #
+// test_neq() -> FAILURE