[heap] Sort sweep pages list by free memory.

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 "src/heap/mark-compact.h"
 #include "src/heap/slots-buffer.h"
 #include "src/isolate.h"
 
 namespace v8 {
 namespace internal {
 
+inline std::vector<Page*>& MarkCompactCollector::sweeping_list(Space* space) {
+  if (space == heap()->old_space()) {
+    return sweeping_list_old_space_;
+  } else if (space == heap()->code_space()) {
+    return sweeping_list_code_space_;
+  }
+  DCHECK_EQ(space, heap()->map_space());
+  return sweeping_list_map_space_;
+}
+
+
 void MarkCompactCollector::PushBlack(HeapObject* obj) {
   DCHECK(Marking::IsBlack(Marking::MarkBitFrom(obj)));
   if (marking_deque_.Push(obj)) {
     MemoryChunk::IncrementLiveBytesFromGC(obj, obj->Size());
   } else {
     Marking::BlackToGrey(obj);
   }
 }
 
 
@@ skipping 161 matching lines @@
     }
     if (object != nullptr) return object;
   }
   return nullptr;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_MARK_COMPACT_INL_H_