Remove obsolete stack trace string in a message object.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 8a2f4219c763e014b89720d2c72fe84da981028b..a0a3227ba44e7c2adbb4f3c3bfdb65a86035e113 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -946,6 +946,9 @@ Failure* Isolate::ReThrow(MaybeObject* exception) {
 
 
 Failure* Isolate::ThrowIllegalOperation() {
+#ifdef DEBUG
+  PrintStack(stdout);
+#endif  // DEBUG
   return Throw(heap_.illegal_access_string());
 }
 
@@ -1122,8 +1125,6 @@ void Isolate::DoThrow(Object* exception, MessageLocation* location) {
     // while the bootstrapper is active since the infrastructure may not have
     // been properly initialized.
     if (!bootstrapping) {
-      Handle<String> stack_trace;
-      if (FLAG_trace_exception) stack_trace = StackTraceString();
       Handle<JSArray> stack_trace_object;
       if (capture_stack_trace_for_uncaught_exceptions_) {
         if (IsErrorObject(exception_handle)) {
@@ -1163,7 +1164,6 @@ void Isolate::DoThrow(Object* exception, MessageLocation* location) {
           "uncaught_exception",
           location,
           HandleVector<Object>(&exception_arg, 1),
-          stack_trace,
           stack_trace_object);
       thread_local_top()->pending_message_obj_ = *message_obj;
       if (location != NULL) {