Remove a ton of old simplescalar crap that we no longer need.

Remove a ton of old simplescalar crap that we no longer need.

sim/base_cpu.cc:
sim/exec_context.hh:
sim/hybrid_pred.cc:
sim/main.cc:
sim/prog.hh:
sim/sat_counter.cc:
sim/sim_object.cc:
sim/sim_object.hh:
sim/simple_cpu.cc:
    old stats begone!

--HG--
extra : convert_revision : b0173f13744466b6d9607797b57f7f9bc9bc769f