[heap] Use the thread-safe free modes also for RemoveRange in SlotSet.

test/cctest/heap/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7059 matching lines @@
 
   for (auto x : slots) {
     RememberedSet<OLD_TO_NEW>::Insert(chunk, x.first);
   }
 
   RememberedSet<OLD_TO_NEW>::Iterate(chunk, [&slots](Address addr) {
     CHECK(slots[addr]);
     return KEEP_SLOT;
   });
 
-  RememberedSet<OLD_TO_NEW>::RemoveRange(chunk, start, start + kPointerSize);
+  RememberedSet<OLD_TO_NEW>::RemoveRange(chunk, start, start + kPointerSize,
+                                         SlotSet::FREE_EMPTY_BUCKETS);
   slots[start] = false;
   RememberedSet<OLD_TO_NEW>::Iterate(chunk, [&slots](Address addr) {
     CHECK(slots[addr]);
     return KEEP_SLOT;
   });
 
   RememberedSet<OLD_TO_NEW>::RemoveRange(chunk, start + kPointerSize,
-                                         start + Page::kPageSize);
+                                         start + Page::kPageSize,
+                                         SlotSet::FREE_EMPTY_BUCKETS);
   slots[start + kPointerSize] = false;
   slots[start + Page::kPageSize - kPointerSize] = false;
   RememberedSet<OLD_TO_NEW>::Iterate(chunk, [&slots](Address addr) {
     CHECK(slots[addr]);
     return KEEP_SLOT;
   });
 
-  RememberedSet<OLD_TO_NEW>::RemoveRange(
-      chunk, start, start + Page::kPageSize + kPointerSize);
+  RememberedSet<OLD_TO_NEW>::RemoveRange(chunk, start,
+                                         start + Page::kPageSize + kPointerSize,
+                                         SlotSet::FREE_EMPTY_BUCKETS);
   slots[start + Page::kPageSize] = false;
   RememberedSet<OLD_TO_NEW>::Iterate(chunk, [&slots](Address addr) {
     CHECK(slots[addr]);
     return KEEP_SLOT;
   });
 
   RememberedSet<OLD_TO_NEW>::RemoveRange(
-      chunk, chunk->area_end() - kPointerSize, chunk->area_end());
+      chunk, chunk->area_end() - kPointerSize, chunk->area_end(),
+      SlotSet::FREE_EMPTY_BUCKETS);
   slots[chunk->area_end() - kPointerSize] = false;
   RememberedSet<OLD_TO_NEW>::Iterate(chunk, [&slots](Address addr) {
     CHECK(slots[addr]);
     return KEEP_SLOT;
   });
 }
 
 }  // namespace internal
 }  // namespace v8