add code to operate in lockstep with legion

src/python/m5/main.py:
    add option to operate in lockstep with legion

--HG--
extra : convert_revision : 2cc90ec0cf7e8d028ee813c2034a77415671a628

src/python/m5/main.py

@@ -181,6 +181,8 @@ bool_option("print-cpseq", default=False,
     help="Print correct path sequence numbers in trace output")
 #bool_option("print-reg-delta", default=False,
 #    help="Print which registers changed to what in trace output")
+bool_option("legion-lock", default=False,
+    help="Compare simulator state with Legion simulator every cycle")
 
 options = attrdict()
 arguments = []
@@ -296,6 +298,7 @@ def main():
     objects.ExecutionTrace.print_fetchseq = options.print_fetch_seq
     objects.ExecutionTrace.print_cpseq = options.print_cpseq
     #objects.ExecutionTrace.print_reg_delta = options.print_reg_delta
+    objects.ExecutionTrace.legion_lockstep = options.legion_lock
 
     sys.argv = arguments
     sys.path = [ os.path.dirname(sys.argv[0]) ] + sys.path