cpu: Update stats for LTAGE bpred

Updated stats in ltage.hh and ltage.cc to use new style stats.

Change-Id: I5f676381fce6f3a0b6abc6044577540e561dcd7b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/36335
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/cpu/pred/ltage.cc

@@ -141,8 +141,3 @@ LTAGE::squash(ThreadID tid, void *bp_history)
     TAGE::squash(tid, bp_history);
 }
 
-void
-LTAGE::regStats()
-{
-    TAGE::regStats();
-}

src/cpu/pred/ltage.hh

@@ -69,7 +69,6 @@ class LTAGE : public TAGE
                 Addr corrTarget) override;
 
     void init() override;
-    virtual void regStats() override;
 
   protected:
     /** The loop predictor object */