[turbofan] Add missing deopt for the assignment in the for-in statement.

test/mjsunit/compiler/regress-416359.js

Index: test/mjsunit/compiler/regress-416359.js
diff --git a/test/mjsunit/compiler/regress-451012.js b/test/mjsunit/compiler/regress-416359.js
similarity index 77%
copy from test/mjsunit/compiler/regress-451012.js
copy to test/mjsunit/compiler/regress-416359.js
index bffc8bc5bdfac32bb561a24153d00157b26ac3a5..18cdc5e72800ab16c49ea2f2091b88ba1c873248 100644
--- a/test/mjsunit/compiler/regress-451012.js
+++ b/test/mjsunit/compiler/regress-416359.js
@@ -2,11 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-"use strict";
+"use strict"
 function f() {
-  for (let v; v; ) {
-    let x;
-  }
+  for (x in {a:0});
 }
 
-f();
+assertThrows(f);