Rename and implement KProperty.accessible -> KCallable.isAccessible

compiler/testData/codegen/boxWithStdlib/reflection/call/cannotCallEnumConstructor.kt

@@ -0,0 +1,15 @@
+import kotlin.reflect.jvm.*
+
+enum class E
+
+fun box(): String {
+    try {
+        val c = E::class.constructors.single()
+        c.isAccessible = true
+        c.call()
+        return "Fail: constructing an enum class should not be allowed"
+    }
+    catch (e: Throwable) {
+        return "OK"
+    }
+}