Minor. Add more tests

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

@@ -0,0 +1,19 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class UInt<T: Int>(val value: T) {
+    operator fun plus(other: UInt<T>) = UInt(value + other.value)
+    fun otherValue(other: UInt<T>) = other.value
+}
+
+fun box(): String {
+    val a = UInt(10)
+    val b = UInt(20)
+    if (a.otherValue(b) != 20) return "fail 1"
+
+    if ((a + b).value != 30) return "fail 2"
+
+    return "OK"
+}