[turbofan] Add TruncateFloat32ToUint32 operator to Turbofan.

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index f8a49c4968f97975ba1cc0b38bae2db3ffb69b10..fd70069dd420925622523b7b3a91bfc10fc9c3f0 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -863,6 +863,12 @@ void InstructionSelector::VisitTruncateFloat32ToInt32(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToUint32(Node* node) {
+  X64OperandGenerator g(this);
+  Emit(kSSEFloat32ToUint32, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitTryTruncateFloat32ToInt64(Node* node) {
   X64OperandGenerator g(this);
   InstructionOperand inputs[] = {g.UseRegister(node->InputAt(0))};