tests: Update external tests (1.1.2-dev-393)

backend.native/tests/external/codegen/box/operatorConventions/overloadedSet.kt

@@ -0,0 +1,11 @@
+object A {
+    operator fun get(i: Int) = 1
+    operator fun set(i: Int, j: Int) {}
+    operator fun set(i: Int, x: Any) { throw Exception() }
+}
+
+fun box(): String {
+    A[0]++
+    A[0] += 1
+    return "OK"
+}