Reland "Only use FreeSpace objects in the free list"

src/heap/heap.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_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 
 #include "src/allocation.h"
@@ skipping 674 matching lines @@
   // Optionally takes an AllocationSite to be appended in an AllocationMemento.
   MUST_USE_RESULT AllocationResult
       CopyJSObject(JSObject* source, AllocationSite* site = NULL);
 
   // Clear the Instanceof cache (used when a prototype changes).
   inline void ClearInstanceofCache();
 
   // Iterates the whole code space to clear all ICs of the given kind.
   void ClearAllICsByKind(Code::Kind kind);
 
-  // For use during bootup.
-  void RepairFreeListsAfterBoot();
+  // FreeSpace objects have a null map after deserialization. Update the map.
+  void RepairFreeListsAfterDeserialization();
 
   template <typename T>
   static inline bool IsOneByte(T t, int chars);
 
   // Move len elements within a given array from src_index index to dst_index
   // index.
   void MoveElements(FixedArray* array, int dst_index, int src_index, int len);
 
   // Sloppy mode arguments object size.
   static const int kSloppyArgumentsObjectSize =
@@ skipping 1877 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_