Reland of "🏄 [heap] Add page evacuation mode for new->old"

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index 3c542bd2edbba5418d4742d4a89eb73a88e71823..58bf2a502998b5ff62973105d566bc75f94ebefc 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -628,14 +628,13 @@ class MarkCompactCollector {
   void RegisterExternallyReferencedObject(Object** object);
 
  private:
+  class EvacuateNewSpacePageVisitor;
   class EvacuateNewSpaceVisitor;
   class EvacuateOldSpaceVisitor;
   class EvacuateRecordOnlyVisitor;
   class EvacuateVisitorBase;
   class HeapObjectVisitor;
 
-  typedef std::vector<Page*> SweepingList;
-
   explicit MarkCompactCollector(Heap* heap);
 
   bool WillBeDeoptimized(Code* code);
@@ -828,7 +827,8 @@ class MarkCompactCollector {
 
   // Iterates through all live objects on a page using marking information.
   // Returns whether all objects have successfully been visited.
-  bool VisitLiveObjects(MemoryChunk* page, HeapObjectVisitor* visitor,
+  template <class Visitor>
+  bool VisitLiveObjects(MemoryChunk* page, Visitor* visitor,
                         IterationMode mode);
 
   void VisitLiveObjectsBody(Page* page, ObjectVisitor* visitor);