Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/reflection/properties/fakeOverridesInSubclass.kt

@@ -0,0 +1,17 @@
+// WITH_REFLECT
+
+import kotlin.reflect.*
+import kotlin.test.*
+
+open class Super(val r: String)
+
+class Sub(r: String) : Super(r)
+
+fun box(): String {
+    val props = Sub::class.java.kotlin.declaredMemberProperties
+    if (!props.isEmpty()) return "Fail $props"
+
+    val allProps = Sub::class.java.kotlin.memberProperties
+    assertEquals(listOf("r"), allProps.map { it.name })
+    return allProps.single().get(Sub("OK")) as String
+}