Fix try-finally for dead AST-branches in TurboFan.

test/mjsunit/regress/regress-crbug-455644.js

Index: test/mjsunit/regress/regress-crbug-455644.js
diff --git a/test/mjsunit/compiler/regress-451012.js b/test/mjsunit/regress/regress-crbug-455644.js
similarity index 60%
copy from test/mjsunit/compiler/regress-451012.js
copy to test/mjsunit/regress/regress-crbug-455644.js
index bffc8bc5bdfac32bb561a24153d00157b26ac3a5..4993d857a89f620df2b0d1f9813a2a382a77bd8d 100644
--- a/test/mjsunit/compiler/regress-451012.js
+++ b/test/mjsunit/regress/regress-crbug-455644.js
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-"use strict";
-function f() {
-  for (let v; v; ) {
-    let x;
+(function f() {
+  do { return 23; } while(false);
+  with (0) {
+    try {
+      return 42;
+    } finally {}
   }
-}
-
-f();
+})();