MIPS64: Add/fix bit insertion/extraction instrs.

src/mips64/assembler-mips64.h

Index: src/mips64/assembler-mips64.h
diff --git a/src/mips64/assembler-mips64.h b/src/mips64/assembler-mips64.h
index 3c0e834c3743a74bb7f4f5dc529f464943497f2b..dc78b890edd64eb4d2aaf37c8dc2b4ab38ba1833 100644
--- a/src/mips64/assembler-mips64.h
+++ b/src/mips64/assembler-mips64.h
@@ -1005,9 +1005,11 @@ class Assembler : public AssemblerBase {
   void ins_(Register rt, Register rs, uint16_t pos, uint16_t size);
   void ext_(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 dextm_(Register rt, Register rs, uint16_t pos, uint16_t size);
+  void dextu_(Register rt, Register rs, uint16_t pos, uint16_t size);
   void dins_(Register rt, Register rs, uint16_t pos, uint16_t size);
+  void dinsm_(Register rt, Register rs, uint16_t pos, uint16_t size);
+  void dinsu_(Register rt, Register rs, uint16_t pos, uint16_t size);
   void bitswap(Register rd, Register rt);
   void dbitswap(Register rd, Register rt);
   void align(Register rd, Register rs, Register rt, uint8_t bp);