MIPS: [turbofan] Add RoundUint32ToFloat32 operator to Turbofan.

src/compiler/mips/instruction-selector-mips.cc

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index 076e47d4dfa07efdc99d6677f2e773ab55f90203..0523e3f49f4ab4bedfd9b4a9f372612a8037c2f1 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -520,7 +520,7 @@ void InstructionSelector::VisitRoundInt32ToFloat32(Node* node) {
 
 
 void InstructionSelector::VisitRoundUint32ToFloat32(Node* node) {
-  UNIMPLEMENTED();
+  VisitRR(this, kMipsCvtSUw, node);
 }