Remove conservative sweeping.

src/heap/mark-compact-inl.h

 // Copyright 2012 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.
 
 #ifndef V8_HEAP_MARK_COMPACT_INL_H_
 #define V8_HEAP_MARK_COMPACT_INL_H_
 
 #include <memory.h>
 
 #include "src/heap/mark-compact.h"
 #include "src/isolate.h"
 
 
 namespace v8 {
 namespace internal {
 
 
 MarkBit Marking::MarkBitFrom(Address addr) {
   MemoryChunk* p = MemoryChunk::FromAddress(addr);
   return p->markbits()->MarkBitFromIndex(p->AddressToMarkbitIndex(addr),
                                          p->ContainsOnlyData());
 }
 
 
 void MarkCompactCollector::SetFlags(int flags) {
-  sweep_precisely_ = ((flags & Heap::kSweepPreciselyMask) != 0);
   reduce_memory_footprint_ = ((flags & Heap::kReduceMemoryFootprintMask) != 0);
   abort_incremental_marking_ =
       ((flags & Heap::kAbortIncrementalMarkingMask) != 0);
 }
 
 
 void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
   DCHECK(Marking::MarkBitFrom(obj) == mark_bit);
   if (!mark_bit.Get()) {
     mark_bit.Set();
@@ skipping 29 matching lines @@
     if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
                             object_page->slots_buffer_address(), slot, mode)) {
       EvictEvacuationCandidate(object_page);
     }
   }
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_MARK_COMPACT_INL_H_