Refactoring of snapshots. This simplifies and improves

src/spaces.h

Index: src/spaces.h
===================================================================
--- src/spaces.h	(revision 12497)
+++ src/spaces.h	(working copy)
@@ -790,14 +790,6 @@
   virtual void Print() = 0;
 #endif
 
-  // After calling this we can allocate a certain number of bytes using only
-  // linear allocation (with a LinearAllocationScope and an AlwaysAllocateScope)
-  // without using freelists or causing a GC.  This is used by partial
-  // snapshots.  It returns true of space was reserved or false if a GC is
-  // needed.  For paged spaces the space requested must include the space wasted
-  // at the end of each when allocating linearly.
-  virtual bool ReserveSpace(int bytes) = 0;
-
  private:
   Heap* heap_;
   AllocationSpace id_;
@@ -1318,6 +1310,11 @@
 
   inline void Zap();
 
+  static inline FreeListNode* cast(MaybeObject* maybe) {
+    ASSERT(!maybe->IsFailure());
+    return reinterpret_cast<FreeListNode*>(maybe);
+  }
+
  private:
   static const int kNextOffset = POINTER_SIZE_ALIGN(FreeSpace::kHeaderSize);
 
@@ -1380,6 +1377,9 @@
   bool IsVeryLong();
 #endif
 
+  // Used after booting the VM.
+  void RepairLists(Heap* heap);
+
   struct SizeStats {
     intptr_t Total() {
       return small_size_ + medium_size_ + large_size_ + huge_size_;
@@ -1460,6 +1460,10 @@
   // linear in the number of objects in the page. It may be slow.
   MUST_USE_RESULT MaybeObject* FindObject(Address addr);
 
+  // During boot the free_space_map is created, and afterwards we may need
+  // to write it into the free list nodes that were already created.
+  virtual void RepairFreeListsAfterBoot();
+
   // Prepares for a mark-compact GC.
   virtual void PrepareForMarkCompact();