Minor. Add more tests

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

@@ -0,0 +1,11 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class X<T: String>(val s: T)
+fun <T: String> foo(x: X<T>, block: (X<T>) -> T = { it.s }) = block(x)
+
+fun box(): String {
+    return foo(X("OK"))
+}