Extract Function: Choose default visibility at analysis phase

idea/testData/refactoring/extractFunction/delegation/delegationByExpression.kt.after

@@ -8,6 +8,6 @@ class A(a: Int, b: Int): T
 
 class B(a: Int, b: Int): T by A(i(a, b), a - b)
 
-fun i(a: Int, b: Int): Int {
+private fun i(a: Int, b: Int): Int {
     return a + b
 }

idea/testData/refactoring/extractFunction/delegation/delegationByExpressionFull.kt.after

@@ -6,6 +6,6 @@ class A(a: Int, b: Int): T
 
 class B(t: T): T by t(t)
 
-fun t(t: T): T {
+private fun t(t: T): T {
     return t
 }

idea/testData/refactoring/extractFunction/delegation/delegationBySuperCall.kt.after

@@ -6,6 +6,6 @@ open class A(a: Int, b: Int)
 
 class B(a: Int, b: Int): A(i(a, b), a - b)
 
-fun i(a: Int, b: Int): Int {
+private fun i(a: Int, b: Int): Int {
     return a + b
 }