CFG: fix label binding for last instruction of finally block

So #KT-18698 Fixed

compiler/testData/cfg/controlStructures/incorrectIndex.kt

@@ -0,0 +1,22 @@
+// See KT-18698
+
+val s = mutableListOf<String>()
+
+fun test(name: String?, flag: Boolean): Boolean {
+    try {
+        name?.let {
+            if (flag) {
+                s.add(it)
+            }
+            else {
+                s.remove(it)
+            }
+
+            return true
+        }
+
+        return false
+    } finally {
+        name?.hashCode()
+    }
+}