[turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index 7b71333b8370afd6d8b7b4ade35edc3d9ee977c2..5f4a33471b99402e96b817ffbb9b6f6d13aa74a8 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -203,6 +203,7 @@ class MachineOperatorBuilder final : public ZoneObject {
   const Operator* ChangeFloat64ToInt32();   // narrowing
   const Operator* ChangeFloat64ToUint32();  // narrowing
   const Operator* ChangeFloat64ToInt64();   // narrowing
+  const Operator* TruncateFloat64ToUint64();
   const Operator* ChangeInt32ToFloat64();
   const Operator* ChangeInt32ToInt64();
   const Operator* ChangeUint32ToFloat64();