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 843f4a7c29b7e81999710de483c26aa932df7093..6f8b42d67cb5d27744898c2f776d4f2ae79d18ec 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);
 }