[turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 4200d0d93784f493e4216f3f776fe31d9e3b1817..75451f0d17eafb3e8df8c851ab24022a58a4f282 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -815,6 +815,8 @@ void InstructionSelector::VisitNode(Node* node) {
       return MarkAsWord32(node), VisitChangeFloat64ToUint32(node);
     case IrOpcode::kChangeFloat64ToInt64:
       return MarkAsWord64(node), VisitChangeFloat64ToInt64(node);
+    case IrOpcode::kTruncateFloat64ToUint64:
+      return MarkAsWord64(node), VisitTruncateFloat64ToUint64(node);
     case IrOpcode::kChangeInt32ToInt64:
       return MarkAsWord64(node), VisitChangeInt32ToInt64(node);
     case IrOpcode::kChangeUint32ToUint64:
@@ -1060,6 +1062,11 @@ void InstructionSelector::VisitChangeFloat64ToInt64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToUint64(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   UNIMPLEMENTED();
 }