Introduce propertyDelegated method in delegates

compiler/testData/codegen/box/delegatedProperty/propertyDelegatedMethod/privateProperty.kt

@@ -0,0 +1,17 @@
+class Delegate {
+    var name = ""
+    fun get(t: Any?, p: PropertyMetadata): String = name
+    fun propertyDelegated(p: PropertyMetadata) { name = p.name }
+}
+
+class A {
+    private val prop by Delegate()
+
+    fun test(): String {
+        return if (prop == "prop") "OK" else "fail"
+    }
+}
+
+fun box(): String {
+    return A().test()
+}