Extract Function: Fix NPE caused by unmatched offset-to-reference maps

#KT-5001 Fixed

idea/testData/refactoring/extractFunction/parameters/misc/kt5001.kt

@@ -0,0 +1,12 @@
+fun Int.bar(n: Int): Boolean {
+    return true
+}
+
+// SIBLING:
+fun main(args: Array<String>) {
+    val t = if (args.size > 0) {
+        <selection>val al = 0
+        al.bar(1)</selection>
+    }
+    else false
+}

idea/testData/refactoring/extractFunction/parameters/misc/kt5001.kt.after

@@ -0,0 +1,16 @@
+fun Int.bar(n: Int): Boolean {
+    return true
+}
+
+// SIBLING:
+fun main(args: Array<String>) {
+    val t = if (args.size > 0) {
+        b()
+    }
+    else false
+}
+
+fun b(): Boolean {
+    val al = 0
+    return al.bar(1)
+}