Disable lazy parsing inside eval (see bug).

test/mjsunit/regress/regress-5736.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.
+
+var my_global = 0;
+
+// The problem was that we allowed lazy functions inside evals, but did not
+// force context allocation on the eval scope. Thus, foo was not context
+// allocated since we didn't realize that a lazy function referred to it.
+eval("let foo = 1; function lazy() { foo = 2; } lazy(); my_global = foo;");
+assertEquals(my_global, 2);