Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/reflection/callBy/simpleMemberFunciton.kt

@@ -0,0 +1,10 @@
+// WITH_REFLECT
+
+class A(val result: String = "OK") {
+    fun foo(x: Int = 42): String {
+        assert(x == 42) { x }
+        return result
+    }
+}
+
+fun box(): String = A::foo.callBy(mapOf(A::foo.parameters.first() to A()))