[turbofan] Fix missing lazy deopt in object literals.

test/mjsunit/regress/regress-crbug-621816.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-//
-// Flags: --allow-natives-syntax
 
+// Flags: --allow-natives-syntax --turbo
+
+function f() {
+  var o = {};
+  o.a = 1;
+}
 function g() {
-  var f;
-  class C extends eval("f = () => delete C; Array") {}
+  var o = { ['a']: function(){} };
   f();
 }
-
-assertThrows(g, SyntaxError);
+f();
+f();
 %OptimizeFunctionOnNextCall(g);
-assertThrows(g, SyntaxError);
+g();