Extract Function: Check for INVISIBLE_* errors during validation phase

#KT-4995 Fixed

idea/testData/refactoring/extractFunction/basic/privateSetter.kt

@@ -0,0 +1,9 @@
+// SIBLING:
+class A {
+    var t = 1
+        private set
+
+    fun test() {
+        <selection>t = 5</selection>
+    }
+}