change when legion-lock causes the simulation to die. It now happens after two consuctive differences since we compare stuff

at slightly different times interrupts are seen the cycle before they happen in m5 so the pc gets changed early.

--HG--
extra : convert_revision : f237363eababb2aad67e5b41670cf40be048a042

src/cpu/exetrace.cc

@@ -609,7 +609,8 @@ Trace::InstRecord::dump(ostream &outs)
                         diffcount++;
                         if (diffcount > 2)
                             fatal("Differences found between Legion and M5\n");
-                    }
+                    } else
+                        diffcount = 0;
 
                     compared = true;
                     shared_data->flags = OWN_LEGION;