MIPS: Add rounding support in simulator and RINT instruction.

src/mips/assembler-mips.cc

Index: src/mips/assembler-mips.cc
diff --git a/src/mips/assembler-mips.cc b/src/mips/assembler-mips.cc
index c96c05b2b14cb222f0b12633804a6c9eba76877d..135228d7b61411ac26523bf2eb9521ef7c55b520 100644
--- a/src/mips/assembler-mips.cc
+++ b/src/mips/assembler-mips.cc
@@ -2206,6 +2206,13 @@ void Assembler::ceil_w_d(FPURegister fd, FPURegister fs) {
 }
 
 
+void Assembler::rint(SecondaryField fmt, FPURegister fd, FPURegister fs) {
+  DCHECK(kArchVariant == kMips32r6);
+  DCHECK((fmt == D) || (fmt == S));
+  GenInstrRegister(COP1, fmt, f0, fs, fd, RINT);
+}
+
+
 void Assembler::cvt_l_s(FPURegister fd, FPURegister fs) {
   DCHECK(IsMipsArchVariant(kMips32r2));
   GenInstrRegister(COP1, S, f0, fs, fd, CVT_L_S);