[turbofan] Add RoundUint32ToFloat32 operator to Turbofan.

src/compiler/x87/instruction-selector-x87.cc

Index: src/compiler/x87/instruction-selector-x87.cc
diff --git a/src/compiler/x87/instruction-selector-x87.cc b/src/compiler/x87/instruction-selector-x87.cc
index 60d4c20b1136901039f13ba31f3ec028e6326319..3f7967dc3ac52c468ab239aa0f623a403d77e674 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -662,6 +662,11 @@ void InstructionSelector::VisitRoundInt32ToFloat32(Node* node) {
 }
 
 
+void InstructionSelector::VisitRoundUint32ToFloat32(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 void InstructionSelector::VisitChangeInt32ToFloat64(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87Int32ToFloat64, g.DefineAsFixed(node, stX_0),