Extract Function: Allow to extract local variables which are used outside of extracted fragment

idea/testData/refactoring/extractFunction/controlFlow/initializer/valueUsedInAnonymousObject.kt

@@ -0,0 +1,11 @@
+// SIBLING:
+fun main(args: Array<String>) {
+    <selection>val a = 1</selection>
+    val t = object: T {
+        override fun foo(n: Int) = n + a
+    }
+}
+
+trait T {
+    fun foo(n: Int): Int
+}