Refactor GetCodeCopyFromTemplate to get a single point where objects are replaced in code.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5354 matching lines @@
 
   // [constant_pool]: The constant pool for this function.
   inline ConstantPoolArray* constant_pool();
   inline void set_constant_pool(Object* constant_pool);
 
   // Get the safepoint entry for the given pc.
   SafepointEntry GetSafepointEntry(Address pc);
 
   // Find an object in a stub with a specified map
   Object* FindNthObject(int n, Map* match_map);
-  void ReplaceNthObject(int n, Map* match_map, Object* replace_with);
 
   // Find the first allocation site in an IC stub.
   AllocationSite* FindFirstAllocationSite();
 
   // Find the first map in an IC stub.
   Map* FindFirstMap();
   void FindAllMaps(MapHandleList* maps);
   void FindAllTypes(TypeHandleList* types);
-  void ReplaceFirstMap(Map* replace);
 
   // Find the first handler in an IC stub.
   Code* FindFirstHandler();
 
   // Find |length| handlers and put them into |code_list|. Returns false if not
   // enough handlers can be found.
   bool FindHandlers(CodeHandleList* code_list, int length = -1);
 
   // Find the first name in an IC stub.
   Name* FindFirstName();
 
-  void ReplaceNthCell(int n, Cell* replace_with);
+  class FindAndReplacePattern;
+  // For each (map-to-find, object-to-replace) pair in the pattern, this
+  // function replaces the corresponding placeholder in the code with the
+  // object-to-replace. The function assumes that pairs in the pattern come in
+  // the same order as the placeholders in the code.
+  void FindAndReplace(const FindAndReplacePattern& pattern);
 
   // The entire code object including its header is copied verbatim to the
   // snapshot so that it can be written in one, fast, memcpy during
   // deserialization. The deserializer will overwrite some pointers, rather
   // like a runtime linker, but the random allocation addresses used in the
   // mksnapshot process would still be present in the unlinked snapshot data,
   // which would make snapshot production non-reproducible. This method wipes
   // out the to-be-overwritten header data for reproducible snapshots.
   inline void WipeOutHeader();
 
@@ skipping 5372 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_