X87: [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 c8522fc6ba48df03e9d0cd6003d62335d5f77d9c..e37d78526c5f489f70c45c5633bd0053d0c1a9be 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -664,7 +664,9 @@ void InstructionSelector::VisitRoundInt32ToFloat32(Node* node) {
 
 
 void InstructionSelector::VisitRoundUint32ToFloat32(Node* node) {
-  UNIMPLEMENTED();
+  X87OperandGenerator g(this);
+  Emit(kX87Uint32ToFloat32, g.DefineAsFixed(node, stX_0),
+       g.Use(node->InputAt(0)));
 }