VectorICs: recreate feedback vector if scoping changes on recompile.

test/mjsunit/regress/regress-476488.js

Index: test/mjsunit/regress/regress-476488.js
diff --git a/test/mjsunit/regress/regress-476488.js b/test/mjsunit/regress/regress-476488.js
new file mode 100644
index 0000000000000000000000000000000000000000..2db6819c0dd0a481285c983a4176511cf703a1b4
--- /dev/null
+++ b/test/mjsunit/regress/regress-476488.js
@@ -0,0 +1,15 @@
+// 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.
+
+// Flags: --always-opt --expose-gc
+
+function __f_0(message, a) {
+  eval(), message;
+  (function blue() {
+    'use strict';
+    eval(), eval(), message;
+    gc();
+  })();
+}
+__f_0();