Implemented the RoundUint64ToFloat64 TurboFan operator for x64 and arm64.

src/compiler/machine-operator.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_MACHINE_OPERATOR_H_
 #define V8_COMPILER_MACHINE_OPERATOR_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/machine-type.h"
 
@@ skipping 193 matching lines @@
   const Operator* ChangeUint32ToFloat64();
   const Operator* ChangeUint32ToUint64();
 
   // These operators truncate or round numbers, both changing the representation
   // of the number and mapping multiple input values onto the same output value.
   const Operator* TruncateFloat64ToFloat32();
   const Operator* TruncateFloat64ToInt32(TruncationMode);
   const Operator* TruncateInt64ToInt32();
   const Operator* RoundInt64ToFloat32();
   const Operator* RoundInt64ToFloat64();
+  const Operator* RoundUint64ToFloat64();
 
   // These operators reinterpret the bits of a floating point number as an
   // integer and vice versa.
   const Operator* BitcastFloat32ToInt32();
   const Operator* BitcastFloat64ToInt64();
   const Operator* BitcastInt32ToFloat32();
   const Operator* BitcastInt64ToFloat64();
 
   // Floating point operators always operate with IEEE 754 round-to-nearest
   // (single-precision).
@@ skipping 105 matching lines @@
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_