Move activity tracking code into its own class. Now the CPU no longer has to keep track of the activity tracking internals; it just calls advance() on the class and uses it to tell if it should deschedule itself.

SConscript:
    Split off activity/idling code into its own class to do the processing separately.
cpu/o3/alpha_cpu_builder.cc:
cpu/o3/alpha_params.hh:
    Activity stuff.  This is mostly for debugging and may be removed later on (or changed to enable/disable activity idling).
cpu/o3/cpu.cc:
    Move activity idling stuff mostly into its own class, so it no longer clutters this file.
cpu/o3/cpu.hh:
    Move activity idling stuff into its own class.
python/m5/objects/AlphaFullCPU.py:
    Add parameter for initial activity value.

--HG--
extra : convert_revision : f32f7cc03895dc07ab57ddba78c5402a1a8b0f1a

SConscript

@@ -80,6 +80,7 @@ base_sources = Split('''
 	base/stats/visit.cc
 	base/stats/text.cc
 
+        cpu/activity.cc
 	cpu/base.cc
         cpu/base_dyn_inst.cc
 	cpu/cpu_exec_context.cc