Add test: operator_parameter_with_wrong_data_location

test/libsolidity/syntaxTests/operators/custom/operator_parameter_with_wrong_data_location.sol

@@ -0,0 +1,10 @@
+struct S { uint128 x; }
+
+using {add as +} for S;
+
+function add(S memory, S storage) returns (S memory) {
+    return S(0);
+}
+
+// ----
+// TypeError 1884: (32-35): The function "add" needs to have two parameters of equal type to be used for the operator +.