[turbofan] Implemented the TruncateFloat32ToUint64 TurboFan operator.

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 aa5cd3544adc02994293a8c65007515376a3263d..2ef096078c2b1b2e265bc85ef4f1f3b1941d094b 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -846,6 +846,12 @@ void InstructionSelector::VisitTruncateFloat64ToInt64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat32ToUint64(Node* node) {
+  X64OperandGenerator g(this);
+  Emit(kSSEFloat32ToUint64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitTruncateFloat64ToUint64(Node* node) {
   X64OperandGenerator g(this);
   Emit(kSSEFloat64ToUint64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));