Revorked version of http://codereview.chromium.org/8101. The only change is

Revorked version of codereview.chromium.org/8101. The only change is
that the exception stored in the TryCatch is not cleared as that was the
cause of the regression.

So the actual difference to http://codereview.chromium.org/8101 is:
Index: src/top.h
===================================================================
--- src/top.h   (revision 576)
+++ src/top.h   (working copy)
@@ -154,10 +154,6 @@
     if (has_pending_exception()) {
       thread_local_.external_caught_exception_ =
           thread_local_.pending_external_caught_exception_;
-    } else {
-      if (thread_local_.try_catch_handler_ != NULL) {
-        thread_local_.try_catch_handler_->Reset();
-      }
     }
     thread_local_.pending_external_caught_exception_ = false;
   }
@@ -312,14 +308,14 @@
 };

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@593 ce2b1a6d-e550-0410-aec6-3dcde31c8c00