Include mark worker performance in report for concurrent mark phase

src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp

@@ -57,7 +57,8 @@ class ShenandoahConcurrentMarkingTask : public WorkerTask {
 
   void work(uint worker_id) {
     ShenandoahHeap* heap = ShenandoahHeap::heap();
-    ShenandoahConcurrentWorkerSession worker_session(worker_id);
+    ShenandoahParallelWorkerSession worker_session(worker_id);
+    ShenandoahWorkerTimingsTracker timer(ShenandoahPhaseTimings::conc_mark, ShenandoahPhaseTimings::ParallelMark, worker_id);
     ShenandoahSuspendibleThreadSetJoiner stsj(ShenandoahSuspendibleWorkers);
     ShenandoahReferenceProcessor* rp = heap->active_generation()->ref_processor();
     assert(rp != NULL, "need reference processor");

src/hotspot/share/gc/shenandoah/shenandoahPhaseTimings.cpp

@@ -113,6 +113,7 @@ bool ShenandoahPhaseTimings::is_worker_phase(Phase phase) {
     case degen_gc_purge_class_unload:
     case degen_gc_purge_weak_par:
     case heap_iteration_roots:
+    case conc_mark:
     case conc_mark_roots:
     case conc_thread_roots:
     case conc_weak_roots_work:

src/hotspot/share/gc/shenandoah/shenandoahPhaseTimings.hpp

@@ -61,6 +61,7 @@ class outputStream;
   f(conc_mark_roots,                                "Concurrent Mark Roots ")          \
   SHENANDOAH_PAR_PHASE_DO(conc_mark_roots,          "  CMR: ", f)                      \
   f(conc_mark,                                      "Concurrent Marking")              \
+  SHENANDOAH_PAR_PHASE_DO(conc_mark,                "  CM: ", f)                       \
                                                                                        \
   f(final_mark_gross,                               "Pause Final Mark (G)")            \
   f(final_mark,                                     "Pause Final Mark (N)")            \