Revert the exception propagation fix. It leads to crashes because...

src/top.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 805 matching lines @@
   clear_pending_message();
 }
 
 
 void Top::TraceException(bool flag) {
   FLAG_trace_exception = flag;
 }
 
 
 bool Top::optional_reschedule_exception(bool is_bottom_call) {
-  // Allways reschedule out of memory exceptions.
-  if (!is_out_of_memory()) {
-    // Never reschedule the exception if this is the bottom call.
-    bool clear_exception = is_bottom_call;
-
-    // If the exception is externally caught, clear it if there are no
-    // JavaScript frames on the way to the C++ frame that has the
-    // external handler.
-    if (thread_local_.external_caught_exception_) {
-      ASSERT(thread_local_.try_catch_handler_ != NULL);
-      Address external_handler_address =
-          reinterpret_cast<Address>(thread_local_.try_catch_handler_);
-      JavaScriptFrameIterator it;
-      if (it.done() || (it.frame()->sp() > external_handler_address)) {
-        clear_exception = true;
-      }
-    }
-
-    // Clear the exception if needed.
-    if (clear_exception) {
-      thread_local_.external_caught_exception_ = false;
-      clear_pending_exception();
-      return false;
-    }
+  if (!is_out_of_memory() &&
+      (thread_local_.external_caught_exception_ || is_bottom_call)) {
+    thread_local_.external_caught_exception_ = false;
+    clear_pending_exception();
+    return false;
+  } else {
+    thread_local_.scheduled_exception_ = pending_exception();
+    clear_pending_exception();
+    return true;
   }
-
-  // Reschedule the exception.
-  thread_local_.scheduled_exception_ = pending_exception();
-  clear_pending_exception();
-  return true;
 }
 
 
 bool Top::is_out_of_memory() {
   if (has_pending_exception()) {
     Object* e = pending_exception();
     if (e->IsFailure() && Failure::cast(e)->IsOutOfMemoryException()) {
       return true;
     }
   }
@@ skipping 46 matching lines @@
   Top::break_access_->Lock();
 }
 
 
 ExecutionAccess::~ExecutionAccess() {
   Top::break_access_->Unlock();
 }
 
 
 } }  // namespace v8::internal