Specify JVM target backend for test with 'import kotlin.reflect.jvm'

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

@@ -1,13 +1,11 @@
 // IGNORE_BACKEND: JVM_IR
-// IGNORE_BACKEND: JS_IR
-// TODO: muted automatically, investigate should it be ran for JS or not
-// IGNORE_BACKEND: JS, NATIVE
+// TARGET_BACKEND: JVM
 
 // WITH_REFLECT
 
 import kotlin.reflect.*
 import kotlin.reflect.full.*
-import kotlin.reflect.jvm.*
+import kotlin.reflect.jvm.isAccessible
 
 class K<in T : String> {
     private var t: T