Parse eagerly inside block scopes.

test/mjsunit/regress/regress-4255-3.js

Index: test/mjsunit/regress/regress-4255-3.js
diff --git a/test/mjsunit/regress/regress-4255-3.js b/test/mjsunit/regress/regress-4255-3.js
new file mode 100644
index 0000000000000000000000000000000000000000..531d0a34dec8a131eb18f8b13ab2d687c3e4cc70
--- /dev/null
+++ b/test/mjsunit/regress/regress-4255-3.js
@@ -0,0 +1,24 @@
+// Copyright 2015 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.
+
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+// comments to trigger lazy compilation comments to trigger lazy compilation
+
+'use strict';
+for (let i in [1, 2, 3]) { function f() {} }
+// Trigger OSR.
+for (var i = 0; i < 1000000; i++);