MIPS: Accurate function prototypes for native calls from ARM simulator.

src/mips/simulator-mips.h

Index: src/mips/simulator-mips.h
diff --git a/src/mips/simulator-mips.h b/src/mips/simulator-mips.h
index ed6344342dca04d9e51a4cecca36e611672dfdf2..a091e5fb20614e171f6cabf6e49375b3f8cd6be7 100644
--- a/src/mips/simulator-mips.h
+++ b/src/mips/simulator-mips.h
@@ -351,10 +351,8 @@ class Simulator {
   static void* RedirectExternalReference(void* external_function,
                                          ExternalReference::Type type);
 
-  // For use in calls that take double value arguments.
-  void GetFpArgs(double* x, double* y);
-  void GetFpArgs(double* x);
-  void GetFpArgs(double* x, int32_t* y);
+  // Handle arguments and return value for runtime FP functions.
+  void GetFpArgs(double* x, double* y, int32_t* z);
   void SetFpResult(const double& result);
 
   void CallInternal(byte* entry);