RegExp stack and zone limits.

src/top.h

Index: src/top.h
diff --git a/src/top.h b/src/top.h
index 431f05e8ff4de84378bec619f9224e32e42694dd..29d46b5d5c1a9fcd96e242447fe385303abcf706 100644
--- a/src/top.h
+++ b/src/top.h
@@ -271,6 +271,8 @@ class Top {
   static char* ArchiveThread(char* to);
   static char* RestoreThread(char* from);
 
+  static const char* kStackOverflowMessage;
+
  private:
   // The context that initiated this JS execution.
   static ThreadLocalTop thread_local_;