Merge boxWithStdlib testData into box, delete BoxWithStdlib test

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

@@ -0,0 +1,32 @@
+// WITH_REFLECT
+
+import kotlin.reflect.*
+import kotlin.reflect.jvm.isAccessible
+
+class A {
+    private var value = 0
+
+    fun ref() = A::class.memberProperties.single() as KMutableProperty1<A, Int>
+}
+
+fun box(): String {
+    val a = A()
+    val p = a.ref()
+    try {
+        p.set(a, 1)
+        return "Fail: private property is accessible by default"
+    } catch(e: IllegalCallableAccessException) { }
+
+    p.isAccessible = true
+
+    p.set(a, 2)
+    p.get(a)
+
+    p.isAccessible = false
+    try {
+        p.set(a, 3)
+        return "Fail: setAccessible(false) had no effect"
+    } catch(e: IllegalCallableAccessException) { }
+
+    return "OK"
+}