Minor. Add more tests

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

@@ -0,0 +1,17 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class Foo<T: Int>(val x: T) {
+    inline fun inc(): Foo<T> = Foo(x + 1) as Foo<T>
+}
+
+fun box(): String {
+    val a = Foo(0)
+    val b = a.inc().inc()
+
+    if (b.x != 2) return "fail"
+
+    return "OK"
+}