branch predictor: move out of o3 and inorder cpus

This patch moves the branch predictor files in the o3 and inorder directories
to src/cpu/pred. This allows sharing the branch predictor across different
cpu models.

This patch was originally posted by Timothy Jones in July 2010
but never made it to the repository.

--HG--
rename : src/cpu/o3/bpred_unit.cc => src/cpu/pred/bpred_unit.cc
rename : src/cpu/o3/bpred_unit.hh => src/cpu/pred/bpred_unit.hh
rename : src/cpu/o3/bpred_unit_impl.hh => src/cpu/pred/bpred_unit_impl.hh
rename : src/cpu/o3/sat_counter.hh => src/cpu/pred/sat_counter.hh

src/cpu/pred/SConscript

@@ -31,8 +31,12 @@
 Import('*')
 
 if 'InOrderCPU' in env['CPU_MODELS'] or 'O3CPU' in env['CPU_MODELS']:
+    SimObject('BranchPredictor.py')
+
+    Source('bpred_unit.cc')
     Source('2bit_local.cc')
     Source('btb.cc')
     Source('ras.cc')
     Source('tournament.cc')
     DebugFlag('FreeList')
+    DebugFlag('Branch')