Extract Function: Support multiple output values

idea/testData/refactoring/extractFunction/controlFlow/outputValues/triple.kt.after

@@ -0,0 +1,34 @@
+// WITH_RUNTIME
+// PARAM_TYPES: kotlin.Int
+// PARAM_TYPES: kotlin.Int
+// PARAM_TYPES: kotlin.Int
+// PARAM_TYPES: kotlin.Int
+// PARAM_DESCRIPTOR: value-parameter val a: kotlin.Int defined in foo
+// PARAM_DESCRIPTOR: var b: kotlin.Int defined in foo
+// PARAM_DESCRIPTOR: var c: kotlin.Int defined in foo
+// PARAM_DESCRIPTOR: var d: kotlin.Int defined in foo
+// SIBLING:
+fun foo(a: Int): Int {
+    var b: Int = 1
+    var c: Int = 1
+    var d: Int = 1
+
+    val triple = triple(a, b, c, d)
+    b = triple.first
+    c = triple.second
+    d = triple.third
+
+    return b + c + d
+}
+
+private fun triple(a: Int, b: Int, c: Int, d: Int): Triple<Int, Int, Int> {
+    var b1 = b
+    var c1 = c
+    var d1 = d
+    b1 += a
+    c1 -= a
+    d1 += c1
+    println(b1)
+    println(c1)
+    return Triple(b1, c1, d1)
+}