sim: Add units to src/sim

Change-Id: I5fa147aa1319d62be1790bbd74fd097ac566f808
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39296
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

src/sim/process.cc

@@ -127,7 +127,7 @@ Process::Process(const ProcessParams &params, EmulationPageTable *pTable,
       fds(std::make_shared<FDArray>(
                   params.input, params.output, params.errout)),
       childClearTID(0),
-      ADD_STAT(numSyscalls, "Number of system calls")
+      ADD_STAT(numSyscalls, UNIT_COUNT, "Number of system calls")
 {
     if (_pid >= System::maxPID)
         fatal("_pid is too large: %d", _pid);