MIPS: Improve implementation of HSeqStringSetChar.

src/mips/lithium-mips.h

Index: src/mips/lithium-mips.h
diff --git a/src/mips/lithium-mips.h b/src/mips/lithium-mips.h
index 7254d83e6398b4006c7010890c4ec97637d4913c..9b4d111855742a53f42ba04ace90dbcb6e1e89f0 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -1342,25 +1342,20 @@ class LDateField V8_FINAL : public LTemplateInstruction<1, 1, 1> {
 
 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_;
 };