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

test/unittests/heap/slot-set-unittest.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits>
 
 #include "src/globals.h"
 #include "src/heap/slot-set.h"
 #include "src/heap/spaces.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 86 matching lines @@
 }
 
 void CheckRemoveRangeOn(uint32_t start, uint32_t end) {
   SlotSet set;
   set.SetPageStart(0);
   uint32_t first = start == 0 ? 0 : start - kPointerSize;
   uint32_t last = end == Page::kPageSize ? end - kPointerSize : end;
   for (uint32_t i = first; i <= last; i += kPointerSize) {
     set.Insert(i);
   }
-  set.RemoveRange(start, end);
+  set.RemoveRange(start, end, SlotSet::FREE_EMPTY_BUCKETS);
   if (first != start) {
     EXPECT_TRUE(set.Lookup(first));
   }
   if (last == end) {
     EXPECT_TRUE(set.Lookup(last));
   }
   for (uint32_t i = start; i < end; i += kPointerSize) {
     EXPECT_FALSE(set.Lookup(i));
   }
 }
@@ skipping 10 matching lines @@
         uint32_t end = (kEnds[i] + k);
         if (start < end) {
           CheckRemoveRangeOn(start * kPointerSize, end * kPointerSize);
         }
       }
     }
   }
   SlotSet set;
   set.SetPageStart(0);
   set.Insert(Page::kPageSize / 2);
-  set.RemoveRange(0, Page::kPageSize);
+  set.RemoveRange(0, Page::kPageSize, SlotSet::FREE_EMPTY_BUCKETS);
   for (uint32_t i = 0; i < Page::kPageSize; i += kPointerSize) {
     EXPECT_FALSE(set.Lookup(i));
   }
 }
 
 TEST(TypedSlotSet, Iterate) {
   TypedSlotSet set(0);
   const int kDelta = 10000001;
   const int kHostDelta = 50001;
   int added = 0;
@@ skipping 26 matching lines @@
         EXPECT_EQ(0, i % 2);
         ++iterated;
         return KEEP_SLOT;
       },
       TypedSlotSet::KEEP_EMPTY_CHUNKS);
   EXPECT_EQ(added / 2, iterated);
 }
 
 }  // namespace internal
 }  // namespace v8