Improve implementation of HSeqStringSetChar.

src/ia32/lithium-codegen-ia32.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 277 matching lines @@
   int32_t ToInteger32(LConstantOperand* op) const;
   ExternalReference ToExternalReference(LConstantOperand* op) const;
 
   Operand BuildFastArrayOperand(LOperand* elements_pointer,
                                 LOperand* key,
                                 Representation key_representation,
                                 ElementsKind elements_kind,
                                 uint32_t offset,
                                 uint32_t additional_index = 0);
 
+  Operand BuildSeqStringOperand(Register string,
+                                LOperand* index,
+                                String::Encoding encoding);
+
   void EmitIntegerMathAbs(LMathAbs* instr);
 
   // Support for recording safepoint and position information.
   void RecordSafepoint(LPointerMap* pointers,
                        Safepoint::Kind kind,
                        int arguments,
                        Safepoint::DeoptMode mode);
   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
   void RecordSafepoint(Safepoint::DeoptMode mode);
   void RecordSafepointWithRegisters(LPointerMap* pointers,
@@ skipping 220 matching lines @@
   Label exit_;
   Label* external_exit_;
   Label done_;
   int instruction_index_;
   LCodeGen::X87Stack x87_stack_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_CODEGEN_IA32_H_