Land two MIPS changes contributed by Paul Lind.

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
===================================================================
--- src/mips/macro-assembler-mips.h	(revision 9004)
+++ src/mips/macro-assembler-mips.h	(working copy)
@@ -524,12 +524,12 @@
   void Ext(Register rt, Register rs, uint16_t pos, uint16_t size);
 
   // Convert unsigned word to double.
-  void Cvt_d_uw(FPURegister fd, FPURegister fs);
-  void Cvt_d_uw(FPURegister fd, Register rs);
+  void Cvt_d_uw(FPURegister fd, FPURegister fs, FPURegister scratch);
+  void Cvt_d_uw(FPURegister fd, Register rs, FPURegister scratch);
 
   // Convert double to unsigned word.
-  void Trunc_uw_d(FPURegister fd, FPURegister fs);
-  void Trunc_uw_d(FPURegister fd, Register rs);
+  void Trunc_uw_d(FPURegister fd, FPURegister fs, FPURegister scratch);
+  void Trunc_uw_d(FPURegister fd, Register rs, FPURegister scratch);
 
   // Convert the HeapNumber pointed to by source to a 32bits signed integer
   // dest. If the HeapNumber does not fit into a 32bits signed integer branch