Minor. Add more tests

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

@@ -0,0 +1,12 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+fun <T> foo(a: IC<String>): T = a.value as T
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class IC<T: String>(val value: T)
+
+fun box(): String {
+    return foo<String>(IC("O")) + "K"
+}