Revert of Replace slots buffer with remembered set.

src/heap/mark-compact-inl.h

Index: src/heap/mark-compact-inl.h
diff --git a/src/heap/mark-compact-inl.h b/src/heap/mark-compact-inl.h
index 9cc7d7c39e57ceb75f5bb78eb3293f26a2c160cb..f117acee9b12f8a28d0af898eb0bcb04176cf715 100644
--- a/src/heap/mark-compact-inl.h
+++ b/src/heap/mark-compact-inl.h
@@ -6,7 +6,7 @@
 #define V8_HEAP_MARK_COMPACT_INL_H_
 
 #include "src/heap/mark-compact.h"
-#include "src/heap/remembered-set.h"
+#include "src/heap/slots-buffer.h"
 #include "src/isolate.h"
 
 namespace v8 {
@@ -70,11 +70,25 @@
 void MarkCompactCollector::RecordSlot(HeapObject* object, Object** slot,
                                       Object* target) {
   Page* target_page = Page::FromAddress(reinterpret_cast<Address>(target));
-  Page* source_page = Page::FromAddress(reinterpret_cast<Address>(object));
   if (target_page->IsEvacuationCandidate() &&
       !ShouldSkipEvacuationSlotRecording(object)) {
-    RememberedSet<OLD_TO_OLD>::Insert(source_page,
-                                      reinterpret_cast<Address>(slot));
+    if (!SlotsBuffer::AddTo(slots_buffer_allocator_,
+                            target_page->slots_buffer_address(), slot,
+                            SlotsBuffer::FAIL_ON_OVERFLOW)) {
+      EvictPopularEvacuationCandidate(target_page);
+    }
+  }
+}
+
+
+void MarkCompactCollector::ForceRecordSlot(HeapObject* object, Object** slot,
+                                           Object* target) {
+  Page* target_page = Page::FromAddress(reinterpret_cast<Address>(target));
+  if (target_page->IsEvacuationCandidate() &&
+      !ShouldSkipEvacuationSlotRecording(object)) {
+    CHECK(SlotsBuffer::AddTo(slots_buffer_allocator_,
+                             target_page->slots_buffer_address(), slot,
+                             SlotsBuffer::IGNORE_OVERFLOW));
   }
 }