O3: Add support of function tracing with O3 CPU.

src/cpu/o3/commit_impl.hh

@@ -52,6 +52,7 @@
 #include "config/use_checker.hh"
 #include "cpu/o3/commit.hh"
 #include "cpu/o3/thread_state.hh"
+#include "cpu/base.hh"
 #include "cpu/exetrace.hh"
 #include "cpu/timebuf.hh"
 #include "debug/Activity.hh"
@@ -992,6 +993,8 @@ DefaultCommit<Impl>::commitInsts()
                 // Updates misc. registers.
                 head_inst->updateMiscRegs();
 
+                cpu->traceFunctions(pc[tid].instAddr());
+
                 TheISA::advancePC(pc[tid], head_inst->staticInst);
 
                 // Keep track of the last sequence number commited