8276833: G1: Make G1EvacFailureRegions::par_iterate const

Reviewed-by: tschatzl, ayang

Author: Hamlin Li

src/hotspot/share/gc/g1/g1EvacFailureRegions.cpp

@@ -56,7 +56,7 @@ void G1EvacFailureRegions::post_collection() {
 
 void G1EvacFailureRegions::par_iterate(HeapRegionClosure* closure,
                                        HeapRegionClaimer* _hrclaimer,
-                                       uint worker_id) {
+                                       uint worker_id) const {
   G1CollectedHeap::heap()->par_iterate_regions_array(closure,
                                                      _hrclaimer,
                                                      _evac_failure_regions,

src/hotspot/share/gc/g1/g1EvacFailureRegions.hpp

@@ -56,7 +56,7 @@ class G1EvacFailureRegions {
   bool contains(uint region_idx) const;
   void par_iterate(HeapRegionClosure* closure,
                    HeapRegionClaimer* _hrclaimer,
-                   uint worker_id);
+                   uint worker_id) const;
 
   uint num_regions_failed_evacuation() const {
     return Atomic::load(&_evac_failure_regions_cur_length);