Extract Function: Implement duplicate search

idea/testData/refactoring/extractFunction/duplicates/branchingMatch1.kt.after

@@ -0,0 +1,70 @@
+// WITH_RUNTIME
+// PARAM_TYPES: kotlin.Int
+// PARAM_TYPES: kotlin.Int
+// PARAM_DESCRIPTOR: value-parameter val a: kotlin.Int defined in test
+// PARAM_DESCRIPTOR: var b: kotlin.Int defined in test
+
+// SIBLING:
+fun test(a: Int): Int {
+    var b: Int = 1
+    val t = i(a, b)
+    return t
+}
+
+private fun i(a: Int, b: Int): Int {
+    var b1 = b
+    return if (a > 0) {
+        b1++
+        b1 + a
+    } else {
+        b1--
+        b1 - a
+    }
+}
+
+fun foo1() {
+    val x = 1
+    var y: Int = x
+    println(
+            i(x, y)
+    )
+}
+
+fun foo2(x: Int) {
+    var p: Int = 1
+    var q: Int
+    if (x > 0) {
+        p++
+        q = p + x
+    }
+    else {
+        p--
+        q = p - x
+    }
+    println(q)
+}
+
+fun foo3(x: Int): Int {
+    var p: Int = 1
+    if (x > 0) {
+        p++
+        return p + x
+    }
+    else {
+        p--
+        return p - x
+    }
+}
+
+fun foo4() {
+    val t: (Int) -> (Int) = {
+        var n = it
+        i(it, n)
+    }
+    println(t(1))
+}
+
+fun foo5(x: Int): Int {
+    var p: Int = 1
+    i(x, p)
+}