[turbofan] Change TruncateFloat64ToUint64 to TryTruncateFloatToUint64.

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 3e5617a1a384f6aba47e6cc9bac4fffef646aa54..6381ac16743dda6cfa36e2e22a6d280bfc2441ea 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -837,8 +837,10 @@ class MacroAssembler: public Assembler {
   void Trunc_uw_d(FPURegister fd, Register rs, FPURegister scratch);
 
   // Convert double to unsigned long.
-  void Trunc_ul_d(FPURegister fd, FPURegister fs, FPURegister scratch);
-  void Trunc_ul_d(FPURegister fd, Register rs, FPURegister scratch);
+  void Trunc_ul_d(FPURegister fd, FPURegister fs, FPURegister scratch,
+                  Register result = no_reg);
+  void Trunc_ul_d(FPURegister fd, Register rs, FPURegister scratch,
+                  Register result = no_reg);
 
   // Convert single to unsigned long.
   void Trunc_ul_s(FPURegister fd, FPURegister fs, FPURegister scratch);