Parse eagerly inside block scopes.

test/mjsunit/regress/regress-4255-1.js

Index: test/mjsunit/regress/regress-4255-1.js
diff --git a/test/mjsunit/regress/regress-4255-1.js b/test/mjsunit/regress/regress-4255-1.js
new file mode 100644
index 0000000000000000000000000000000000000000..78fe860290be517983d226cce8b46dd7cc948d5c
--- /dev/null
+++ b/test/mjsunit/regress/regress-4255-1.js
@@ -0,0 +1,26 @@
+// 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';
+{
+  let x = function() {};
+  // Trigger OSR.
+  for (var i = 0; i < 1000000; i++);
+}