8367378: GenShen: Missing timing stats when old mark buffers are flushed during final update refs

Backport-of: 11df28916af4c2bfd69b2829c74e046ad953ee6c

Author: William Kemper

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

@@ -1198,6 +1198,7 @@ void ShenandoahConcurrentGC::op_final_update_refs() {
     // We are not concerned about skipping this step in abbreviated cycles because regions
     // with no live objects cannot have been written to and so cannot have entries in the SATB
     // buffers.
+    ShenandoahGCPhase phase(ShenandoahPhaseTimings::final_update_refs_transfer_satb);
     heap->old_generation()->transfer_pointers_from_satb();
 
     // Aging_cycle is only relevant during evacuation cycle for individual objects and during final mark for

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

@@ -126,6 +126,7 @@ class outputStream;
   f(final_update_refs,                              "Pause Final Update Refs (N)")     \
   f(final_update_refs_verify,                       "  Verify")                        \
   f(final_update_refs_update_region_states,         "  Update Region States")          \
+  f(final_update_refs_transfer_satb,                "  Transfer Old From SATB")        \
   f(final_update_refs_trash_cset,                   "  Trash Collection Set")          \
   f(final_update_refs_rebuild_freeset,              "  Rebuild Free Set")              \
   f(final_update_refs_propagate_gc_state,           "  Propagate GC State")            \