Extract Function: Support multiple output values

idea/testData/refactoring/extractFunction/controlFlow/outputValues/initializersAndUpdate.kt

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+// PARAM_TYPES: kotlin.Int
+// PARAM_DESCRIPTOR: var k: kotlin.Int defined in foo
+// SIBLING:
+fun foo() {
+    var k = 0
+    <selection>val a = 1
+    k++
+    val b = 2</selection>
+    println(a + b - k)
+}