[turbofan] Add RoundUint32ToFloat32 operator to Turbofan.

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index fa21d52d1565d6d377cfeebc7c4cefbdd6906676..86a14bd90773a714b071d4765243c9b98cf2525f 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -700,6 +700,14 @@ void InstructionSelector::VisitRoundInt32ToFloat32(Node* node) {
 }
 
 
+void InstructionSelector::VisitRoundUint32ToFloat32(Node* node) {
+  IA32OperandGenerator g(this);
+  InstructionOperand temps[] = {g.TempRegister(), g.TempRegister()};
+  Emit(kSSEUint32ToFloat32, g.DefineAsRegister(node), g.Use(node->InputAt(0)),
+       arraysize(temps), temps);
+}
+
+
 void InstructionSelector::VisitChangeInt32ToFloat64(Node* node) {
   VisitRO(this, node, kSSEInt32ToFloat64);
 }