MIPS: Followup '[turbofan] Introduce new operators Float32SubPreserveNan and Float64SubPreserveNan'.

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 27a34b32bfa12f6a9110214ffdee5a86b6ff8459..4ed898ee40fe74574d438a233f170cdd075592ba 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -929,6 +929,12 @@ class MacroAssembler: public Assembler {
   void Floor_w_d(FPURegister fd, FPURegister fs);
   void Ceil_w_d(FPURegister fd, FPURegister fs);
 
+  // Preserve value of a NaN operand
+  void SubNanPreservePayloadAndSign_s(FPURegister fd, FPURegister fs,
+                                      FPURegister ft);
+  void SubNanPreservePayloadAndSign_d(FPURegister fd, FPURegister fs,
+                                      FPURegister ft);
+
   void Madd_d(FPURegister fd,
               FPURegister fr,
               FPURegister fs,