Support StringCharCodeAt in hydrogen/lithium.

src/hydrogen.h

 // Copyright 2011 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 727 matching lines @@
                                    FunctionLiteral* function);
 
   // Helpers for flow graph construction.
   void LookupGlobalPropertyCell(Variable* var,
                                 LookupResult* lookup,
                                 bool is_store);
 
   bool TryArgumentsAccess(Property* expr);
   bool TryCallApply(Call* expr);
   bool TryInline(Call* expr);
-  bool TryMathFunctionInline(Call* expr);
+  bool TryInlineBuiltinFunction(Call* expr,
+                                HValue* receiver,
+                                Handle<Map> receiver_map,
+                                CheckType check_type);
   void TraceInline(Handle<JSFunction> target, bool result);
 
   void HandleGlobalVariableAssignment(Variable* var,
                                       HValue* value,
                                       int position,
                                       int ast_id);
 
   void HandlePropertyAssignment(Assignment* expr);
   void HandleCompoundAssignment(Assignment* expr);
   void HandlePolymorphicLoadNamedField(Property* expr,
@@ skipping 298 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_