Implemented the RoundUint64ToFloat64 TurboFan operator for x64 and arm64.

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

 // Copyright 2014 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.
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/ppc/frames-ppc.h"
 
@@ skipping 953 matching lines @@
 
 
 void InstructionSelector::VisitRoundInt64ToFloat32(Node* node) {
   VisitRR(this, kPPC_Int64ToFloat32, node);
 }
 
 
 void InstructionSelector::VisitRoundInt64ToFloat64(Node* node) {
   VisitRR(this, kPPC_Int64ToDouble, node);
 }
+
+
+void InstructionSelector::VisitRoundUint64ToFloat64(Node* node) {
+  UNIMPLEMENTED();
+}
 #endif
 
 
 void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
   VisitRR(this, kPPC_BitcastFloat32ToInt32, node);
 }
 
 
 #if V8_TARGET_ARCH_PPC64
 void InstructionSelector::VisitBitcastFloat64ToInt64(Node* node) {
@@ skipping 647 matching lines @@
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32Popcnt |
          MachineOperatorBuilder::kWord64Popcnt;
   // We omit kWord32ShiftIsSafe as s[rl]w use 0x3f as a mask rather than 0x1f.
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8