Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/jvmField/topLevelFieldReflection.kt

@@ -0,0 +1,29 @@
+// WITH_REFLECT
+
+package test
+
+import kotlin.reflect.KMutableProperty0
+import kotlin.reflect.jvm.kotlinProperty
+import kotlin.test.assertEquals
+
+public var publicField = "1"
+internal var internalField = "2"
+
+fun testAccessors() {
+    val packageClass = Class.forName("test.TopLevelFieldReflectionKt")
+    packageClass.getDeclaredField("publicField").kotlinProperty
+    checkAccessor(packageClass.getDeclaredField("publicField").kotlinProperty as KMutableProperty0<String>, "1", "3")
+    checkAccessor(packageClass.getDeclaredField("internalField").kotlinProperty as KMutableProperty0<String>, "2", "4")
+}
+
+
+fun box(): String {
+    testAccessors()
+    return "OK"
+}
+
+public fun < R> checkAccessor(prop: KMutableProperty0<R>, value: R, newValue: R) {
+    assertEquals(prop.get(), value, "Property ${prop} has wrong value")
+    prop.set(newValue)
+    assertEquals(prop.get(), newValue, "Property ${prop} has wrong value")
+}