Compute the right catch location for the debugger.

Also remove tls ThrowLocation, it is not needed anymore.

Change-Id: I78fddf09ce968ca475e39c17fa76d699c589c8d9
diff --git a/runtime/monitor.cc b/runtime/monitor.cc
index 45a971d..dce8bac 100644
--- a/runtime/monitor.cc
+++ b/runtime/monitor.cc
@@ -306,7 +306,7 @@
     std::ostringstream ss;
     self->Dump(ss);
     LOG(Runtime::Current()->IsStarted() ? INFO : ERROR)
-        << self->GetException(NULL)->Dump() << "\n" << ss.str();
+        << self->GetException()->Dump() << "\n" << ss.str();
   }
   va_end(args);
 }