Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/reflection/call/memberOfGenericClass.kt

@@ -0,0 +1,14 @@
+// WITH_REFLECT
+
+var result = "Fail"
+
+class A<T> {
+    fun foo(t: T) {
+        result = t as String
+    }
+}
+
+fun box(): String {
+    (A<String>::foo).call(A<String>(), "OK")
+    return result
+}