Minor. Add more tests

compiler/testData/codegen/box/inlineClasses/jvm8DefaultInterfaceMethods/jvmDefaultGenericGeneric.kt

@@ -0,0 +1,19 @@
+// !JVM_DEFAULT_MODE: all
+// TARGET_BACKEND: JVM
+// WITH_STDLIB
+// JVM_TARGET: 1.8
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+class Cell<T>(val x: T)
+
+interface IOk {
+    fun ok(): String = "OK"
+}
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class InlineClass<T: String>(val s: T) : IOk
+
+fun test(cell: Cell<InlineClass<String>>): String = cell.x.ok()
+
+fun box() = test(Cell(InlineClass("FAIL")))