Introduce propertyDelegated method in delegates

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

@@ -0,0 +1,14 @@
+class Delegate {
+    var name = ""
+    fun get(t: Any?, p: PropertyMetadata): String = name
+}
+
+fun Delegate.propertyDelegated(p: PropertyMetadata) { name = p.name }
+
+class A {
+    val prop by Delegate()
+}
+
+fun box(): String {
+    return if (A().prop == "prop") "OK" else "fail"
+}