Centralize handler caching and probing in ic.cc.

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 5030 matching lines @@
   // Find the first map in an IC stub.
   Map* FindFirstMap();
   void FindAllMaps(MapHandleList* maps);
   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.
-  MUST_USE_RESULT bool FindHandlers(CodeHandleList* code_list, int length);
+  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 ExtraICStateStrictMode: public BitField<StrictModeFlag, 0, 1> {};
   class ExtraICStateKeyedAccessStoreMode:
       public BitField<KeyedAccessStoreMode, 1, 4> {};  // NOLINT
 
@@ skipping 5223 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_