Support 'accessible' for reflected properties on JVM

Calls Java reflection's isAccessible/setAccessible

compiler/testData/codegen/boxWithStdlib/callableReference/property/privateClassVar.kt

@@ -0,0 +1,29 @@
+import kotlin.reflect.jvm.accessible
+
+class A {
+    private var value = 0
+
+    fun ref(): KMutableMemberProperty<A, Int> = ::value
+}
+
+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: IllegalAccessException) { }
+
+    p.accessible = true
+
+    p.set(a, 2)
+    p.get(a)
+
+    p.accessible = false
+    try {
+        p.set(a, 3)
+        return "Fail: setAccessible(false) had no effect"
+    } catch(e: IllegalAccessException) { }
+
+    return "OK"
+}