Improve implementation of HSeqStringSetChar.

src/x64/lithium-x64.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 1265 matching lines @@
   DECLARE_CONCRETE_INSTRUCTION(DateField, "date-field")
   DECLARE_HYDROGEN_ACCESSOR(DateField)
 
  private:
   Smi* index_;
 };
 
 
 class LSeqStringSetChar V8_FINAL : public LTemplateInstruction<1, 3, 0> {
  public:
-  LSeqStringSetChar(String::Encoding encoding,
-                    LOperand* string,
+  LSeqStringSetChar(LOperand* string,
                     LOperand* index,
-                    LOperand* value) : encoding_(encoding) {
+                    LOperand* value) {
     inputs_[0] = string;
     inputs_[1] = index;
     inputs_[2] = value;
   }
 
-  String::Encoding encoding() { return encoding_; }
   LOperand* string() { return inputs_[0]; }
   LOperand* index() { return inputs_[1]; }
   LOperand* value() { return inputs_[2]; }
 
   DECLARE_CONCRETE_INSTRUCTION(SeqStringSetChar, "seq-string-set-char")
   DECLARE_HYDROGEN_ACCESSOR(SeqStringSetChar)
-
- private:
-  String::Encoding encoding_;
 };
 
 
 class LThrow V8_FINAL : public LTemplateInstruction<0, 1, 0> {
  public:
   explicit LThrow(LOperand* value) {
     inputs_[0] = value;
   }
 
   LOperand* value() { return inputs_[0]; }
@@ skipping 1396 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::int
 
 #endif  // V8_X64_LITHIUM_X64_H_