Extract Function: Merge initialized declarations on call site when possible

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

@@ -1,9 +1,7 @@
 // WITH_RUNTIME
 // SIBLING:
 fun foo() {
-    val pair = pair()
-    val a = pair.first
-    val b = pair.second
+    val (a, b) = pair()
     println(a + b)
 }
 

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

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+// SIBLING:
+fun foo() {
+    <selection>var a = 1
+    var b = 2</selection>
+    println(a + b)
+}

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

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+// SIBLING:
+fun foo() {
+    var (a, b) = pair()
+    println(a + b)
+}
+
+private fun pair(): Pair<Int, Int> {
+    var a = 1
+    var b = 2
+    return Pair(a, b)
+}

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

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+// SIBLING:
+fun foo() {
+    <selection>val a = 1
+    var b = 2</selection>
+    println(a + b)
+}

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

@@ -0,0 +1,14 @@
+// WITH_RUNTIME
+// SIBLING:
+fun foo() {
+    val pair = pair()
+    val a = pair.first
+    var b = pair.second
+    println(a + b)
+}
+
+private fun pair(): Pair<Int, Int> {
+    val a = 1
+    var b = 2
+    return Pair(a, b)
+}