MIPS: Add rounding support in simulator and RINT instruction.

src/mips64/simulator-mips64.h

Index: src/mips64/simulator-mips64.h
diff --git a/src/mips64/simulator-mips64.h b/src/mips64/simulator-mips64.h
index 63172389a35a1aaaa3dafd3d5356480df1a95795..fba2b220e1cf7f2531636f4921646428a2242c10 100644
--- a/src/mips64/simulator-mips64.h
+++ b/src/mips64/simulator-mips64.h
@@ -207,6 +207,10 @@ class Simulator {
   bool test_fcsr_bit(uint32_t cc);
   bool set_fcsr_round_error(double original, double rounded);
   bool set_fcsr_round64_error(double original, double rounded);
+  void round_according_to_fcsr(double toRound, double& rounded,
+                               int32_t& rounded_int, double fs);
+  void round64_according_to_fcsr(double toRound, double& rounded,
+                                 int64_t& rounded_int, double fs);
 
   // Special case of set_register and get_register to access the raw PC value.
   void set_pc(int64_t value);