8342382: Implementation of JEP G1: Improve Application Throughput with a More Efficient Write-Barrier

src/hotspot/share/gc/g1/g1ConcurrentRefine.cpp

@@ -270,7 +270,7 @@
 
     set_state_start_time();
   } else {
-    assert(is_in_progress() && _state < State::SnapshotHeap, "Must be before %s but is %s", state_name(State::SnapshotHeap), state_name(_state));
+    assert_state(State::Idle);
   }
 
   snapshot_heap_into(_sweep_table);
@@ -344,7 +344,7 @@
 
 void G1ConcurrentRefineWorkState::snapshot_heap_into(G1CardTableClaimTable* sweep_table) {
   // G1CollectedHeap::heap_region_iterate() will only visit committed regions. In the
   // state table 
   sweep_table->reset_all_claims_to_claimed();
 
   class SnapshotRegionsClosure : public G1HeapRegionClosure {