Minor. Add more tests

compiler/testData/codegen/box/inlineClasses/kt27132Generic.kt

@@ -0,0 +1,24 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class Ucn<T: UInt>(private val i: T)
+
+interface Input<T> {
+    fun foo(n: Int = 0): T
+}
+
+fun Char.toUInt() = toInt().toUInt()
+
+class Kx(val x: UInt) : Input<Ucn<UInt>> {
+    override fun foo(n: Int): Ucn<UInt> =
+        if (n < 0) Ucn(0u) else Ucn(x)
+}
+
+fun box(): String {
+    val p = Kx(42u).foo()
+    if (p.toString() != "Ucn(i=42)") throw AssertionError()
+
+    return "OK"
+}