Minor. Add more tests

compiler/testData/codegen/box/inlineClasses/kt33119Generic.kt

@@ -0,0 +1,21 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class WrappingInt<T: Int>(val value: T) {
+    operator fun inc(): WrappingInt<T> = plus(1)
+    operator fun plus(num: Int): WrappingInt<T> = WrappingInt(((value + num) and 0xFFFF) as T)
+}
+
+fun box(): String {
+    var x = WrappingInt(65535)
+    x++
+    if (x.value != 0) throw AssertionError("x++: ${x.value}")
+
+    var y = WrappingInt(65535)
+    ++y
+    if (y.value != 0) throw AssertionError("++y: ${y.value}")
+
+    return "OK"
+}