Use delegate initializer expression resolution scope for 'toDelegateFor' resolution.

compiler/testData/codegen/box/delegatedProperty/toDelegateFor/extensionDelegated.kt

@@ -0,0 +1,16 @@
+import kotlin.reflect.KProperty
+
+var log = ""
+
+class UserDataProperty<in R>(val key: String) {
+    operator fun getValue(thisRef: R, desc: KProperty<*>) = thisRef.toString() + key
+
+    operator fun setValue(thisRef: R, desc: KProperty<*>, value: String?) { log += "set"}
+}
+
+
+var String.calc: String by UserDataProperty("K")
+
+fun box(): String {
+    return "O".calc
+}