[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 8651bbb1246e8dd167819d9909d3ec242ace7dbe..db229430476d01396d4fb3e9d9e24e95f12c7aa3 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -508,6 +508,11 @@ void InstructionSelector::VisitRoundInt32ToFloat32(Node* node) {
 }
 
 
+void InstructionSelector::VisitRoundUint32ToFloat32(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 void InstructionSelector::VisitChangeInt32ToFloat64(Node* node) {
   VisitRR(this, kMipsCvtDW, node);
 }