Extract Function: Utilize pseudo-value usage for return type inference

idea/testData/refactoring/extractFunction/controlFlow/evaluateExpression/evalExprInWhenSubject.kt

@@ -0,0 +1,9 @@
+// SIBLING:
+fun foo(a: Int): Int {
+    val b: Int = 1
+    return when (<selection>a + b</selection>) {
+        0 -> b
+        1 -> -b
+        else -> a - b
+    }
+}