8303244: G1: call CardTable::clear_MemRegion directly

Reviewed-by: ysr, kbarrett

Author: albertnetymk

src/hotspot/share/gc/g1/g1CardTable.cpp

@@ -44,7 +44,7 @@ void G1CardTable::verify_g1_young_region(MemRegion mr) {
 void G1CardTableChangedListener::on_commit(uint start_idx, size_t num_regions, bool zero_filled) {
   // Default value for a clean card on the card table is -1. So we cannot take advantage of the zero_filled parameter.
   MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_idx), num_regions * HeapRegion::GrainWords);
-  _card_table->clear(mr);
+  _card_table->clear_MemRegion(mr);
 }
 
 void G1CardTable::initialize(G1RegionToSpaceMapper* mapper) {

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

@@ -135,7 +135,7 @@ void HeapRegion::hr_clear(bool clear_space) {
 
 void HeapRegion::clear_cardtable() {
   G1CardTable* ct = G1CollectedHeap::heap()->card_table();
-  ct->clear(MemRegion(bottom(), end()));
+  ct->clear_MemRegion(MemRegion(bottom(), end()));
 }
 
 void HeapRegion::calc_gc_efficiency() {