MIPS64: Fix move operations from coprocessor in simulator.

This resolves calculation errors for trigonometric functions.

TEST=test262/S15.8.2.7_A6.js
BUG=
R=jkummerow@chromium.org, paul.lind@imgtec.com

Review URL: https://codereview.chromium.org/558163006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24013 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips64/simulator-mips64.cc

@@ -1109,9 +1109,9 @@ int32_t Simulator::get_fpu_register_signed_word(int fpureg) const {
 }
 
 
-uint32_t Simulator::get_fpu_register_hi_word(int fpureg) const {
+int32_t Simulator::get_fpu_register_hi_word(int fpureg) const {
   DCHECK((fpureg >= 0) && (fpureg < kNumFPURegisters));
-  return static_cast<uint32_t>((FPUregisters_[fpureg] >> 32) & 0xffffffff);
+  return static_cast<int32_t>((FPUregisters_[fpureg] >> 32) & 0xffffffff);
 }
 
 

src/mips64/simulator-mips64.h

@@ -200,7 +200,7 @@ class Simulator {
   int64_t get_fpu_register(int fpureg) const;
   int32_t get_fpu_register_word(int fpureg) const;
   int32_t get_fpu_register_signed_word(int fpureg) const;
-  uint32_t get_fpu_register_hi_word(int fpureg) const;
+  int32_t get_fpu_register_hi_word(int fpureg) const;
   float get_fpu_register_float(int fpureg) const;
   double get_fpu_register_double(int fpureg) const;
   void set_fcsr_bit(uint32_t cc, bool value);