MIPS: Add rounding support in simulator and RINT instruction.

src/mips/disasm-mips.cc

Index: src/mips/disasm-mips.cc
diff --git a/src/mips/disasm-mips.cc b/src/mips/disasm-mips.cc
index 0f7abab5a2c9b422e232874425522faebe629fe0..a6690883f0ad6b5e9288794105f8cb817ff02a95 100644
--- a/src/mips/disasm-mips.cc
+++ b/src/mips/disasm-mips.cc
@@ -487,6 +487,9 @@ void Decoder::Unknown(Instruction* instr) {
 
 bool Decoder::DecodeTypeRegisterRsType(Instruction* instr) {
   switch (instr->FunctionFieldRaw()) {
+    case RINT:
+      Format(instr, "rint.'t    'fd, 'fs");
+      break;
     case MIN:
       Format(instr, "min.'t    'fd, 'fs, 'ft");
       break;