Move stack unwinding logic into the runtime.

test/mjsunit/regexp-stack-overflow.js

Index: test/mjsunit/regexp-stack-overflow.js
diff --git a/test/mjsunit/regexp-stack-overflow.js b/test/mjsunit/regexp-stack-overflow.js
new file mode 100644
index 0000000000000000000000000000000000000000..63f6971ace245a5c34b05dd16273c9857d3774c5
--- /dev/null
+++ b/test/mjsunit/regexp-stack-overflow.js
@@ -0,0 +1,18 @@
+// 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: --stack-size=100
+
+var re = /\w/;
+re.test("a");  // Trigger regexp compile.
+
+function rec() {
+  try {
+    return rec();
+  } catch (e) {
+    return re.test("b");
+  }
+}
+
+assertTrue(rec());