MIPS: Implement Neg_d and Neg_s instruction macros.

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 1fddf2f30a42b3de5d9a72767f7351b9fbaf1248..578a7dacea0e45e1d44e07a9c32397f8b50900f2 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -880,6 +880,8 @@ class MacroAssembler: public Assembler {
   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 Neg_s(FPURegister fd, FPURegister fs);
+  void Neg_d(FPURegister fd, FPURegister fs);
 
   // MIPS64 R6 instruction macros.
   void Bovc(Register rt, Register rs, Label* L);