Extract Function: Support multiple output values

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/errors.kt.fragment

@@ -2,4 +2,4 @@ prop += 1
 prop2 +=2
 prop + prop2
 
-// RESULT: Cannot perform an action because this code fragment changes more than one variable: var prop2: Int, var prop: Int
+// RESULT: instance of kotlin.Triple(id=ID): Lkotlin/Triple;

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/vars.kt

@@ -10,8 +10,5 @@ fun main(args: Array<String>) {
 // EXPRESSION: a
 // RESULT: 2: I
 
-// EXPRESSION: a += 1
-// RESULT: 3: I
-
 // EXPRESSION: a
 // RESULT: 2: I

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/vars.kt.fragment

@@ -0,0 +1,4 @@
+a += 1
+a
+
+// RESULT: 3: I