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 730 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,
                                        HValue* object,
                                        ZoneMapList* types,
                                        Handle<String> name);
   void HandlePolymorphicStoreNamedField(Assignment* expr,
                                         HValue* object,
                                         HValue* value,
                                         ZoneMapList* types,
                                         Handle<String> name);
   void HandlePolymorphicCallNamed(Call* expr,
                                   HValue* receiver,
                                   ZoneMapList* types,
                                   Handle<String> name);
 
+  HStringCharCodeAt* BuildStringCharCodeAt(HValue* string,
+                                           HValue* index);
   HInstruction* BuildBinaryOperation(BinaryOperation* expr,
                                      HValue* left,
                                      HValue* right);
   HInstruction* BuildIncrement(HValue* value, bool increment);
   HLoadNamedField* BuildLoadNamedField(HValue* object,
                                        Property* expr,
                                        Handle<Map> type,
                                        LookupResult* result,
                                        bool smi_and_map_check);
   HInstruction* BuildLoadNamedGeneric(HValue* object, Property* expr);
@@ skipping 275 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_