Minor. Add more tests

compiler/testData/codegen/box/inlineClasses/referToUnderlyingPropertyOfInlineClassGeneric.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)
+
+fun box(): String {
+    val a = UInt(123)
+    if(a.value != 123) return "fail"
+
+    val c = a.value.hashCode()
+    if (c.hashCode() != 123.hashCode()) return "fail"
+
+    val b = UInt(100).value + a.value
+    if (b != 223) return "faile"
+
+    return "OK"
+}