Minor. Add more tests

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

@@ -0,0 +1,20 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class Foo<T: Any>(val s: T) {
+    fun isString(): Boolean = s is String
+}
+
+class Box<T>(val x: T)
+
+fun box(): String {
+    val f = Foo("string")
+    val g = Box(f)
+    val r = g.x.isString()
+
+    if (!r) return "Fail"
+
+    return "OK"
+}