Always update raw pointers when handling interrupts inside RegExp code.

test/mjsunit/regress/regress-crbug-469480.js

Index: test/mjsunit/regress/regress-crbug-469480.js
diff --git a/test/mjsunit/regress/regress-crbug-469480.js b/test/mjsunit/regress/regress-crbug-469480.js
new file mode 100644
index 0000000000000000000000000000000000000000..8bb0c523ae3011572ed0ef755602db1e1df7d07a
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-469480.js
@@ -0,0 +1,13 @@
+// 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: --allow-natives-syntax --stress-compaction --verify-heap
+// Flags: --stack-size=100
+
+// Load the debug context to fill up code space.
+%GetDebugContext();
+%GetDebugContext();
+
+// Recurse and run regexp code.
+assertThrows(function f() { f(/./.test("a")); }, RangeError);