MIPS64: Add/fix bit insertion/extraction instrs.

src/mips64/macro-assembler-mips64.h

Index: src/mips64/macro-assembler-mips64.h
diff --git a/src/mips64/macro-assembler-mips64.h b/src/mips64/macro-assembler-mips64.h
index 3a368ec166a991bd38a016e32c689d94a43310a8..ef13a2f57f8cd766f4d8a06d7ab07d058cd81196 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -863,15 +863,10 @@ class MacroAssembler: public Assembler {
   void LoadFromSafepointRegisterSlot(Register dst, Register src);
 
   // MIPS64 R2 instruction macro.
-  void Ins(Register rt, Register rs, uint16_t pos, uint16_t size);
-  void Dins(Register rt, Register rs, uint16_t pos, uint16_t size);
   void Ext(Register rt, Register rs, uint16_t pos, uint16_t size);
-
-  void ExtractBits(Register rt, Register rs, uint16_t pos, uint16_t size);
-
   void Dext(Register rt, Register rs, uint16_t pos, uint16_t size);
-  void Dextm(Register rt, Register rs, uint16_t pos, uint16_t size);
-  void Dextu(Register rt, Register rs, uint16_t pos, uint16_t size);
+  void Ins(Register rt, Register rs, uint16_t pos, uint16_t size);
+  void Dins(Register rt, Register rs, uint16_t pos, uint16_t size);
   void Neg_s(FPURegister fd, FPURegister fs);
   void Neg_d(FPURegister fd, FPURegister fs);