MIPS: [turbofan] Add RoundUint32ToFloat32 operator to Turbofan.

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index 8edbb9eba0ad9462b789fde52c230f0c938d95da..a0ffa37200dbd6e32fabd9511a9be3d64eff4a0d 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -1215,6 +1215,10 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ cvt_s_w(i.OutputDoubleRegister(), scratch);
       break;
     }
+    case kMips64CvtSUw: {
+      __ Cvt_s_uw(i.OutputDoubleRegister(), i.InputRegister(0));
+      break;
+    }
     case kMips64CvtSL: {
       FPURegister scratch = kScratchDoubleReg;
       __ dmtc1(i.InputRegister(0), scratch);