[turbofan] Prevent storing signalling NaNs into holey double arrays.

src/compiler/arm64/instruction-selector-arm64.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/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 2383 matching lines @@
     Node* right_of_left = left->InputAt(1);
     Emit(kArm64Bfi, g.DefineSameAsFirst(left), g.UseRegister(right_of_left),
          g.UseRegister(right), g.TempImmediate(32), g.TempImmediate(32));
     Emit(kArm64Float64MoveU64, g.DefineAsRegister(node), g.UseRegister(left));
     return;
   }
   Emit(kArm64Float64InsertHighWord32, g.DefineAsRegister(node),
        g.UseRegister(left), g.UseRegister(right));
 }
 
+void InstructionSelector::VisitFloat64SilenceNaN(Node* node) {
+  VisitRR(this, kArm64Float64SilenceNaN, node);
+}
+
 void InstructionSelector::VisitAtomicLoad(Node* node) {
   LoadRepresentation load_rep = LoadRepresentationOf(node->op());
   Arm64OperandGenerator g(this);
   Node* base = node->InputAt(0);
   Node* index = node->InputAt(1);
   ArchOpcode opcode = kArchNop;
   switch (load_rep.representation()) {
     case MachineRepresentation::kWord8:
       opcode = load_rep.IsSigned() ? kAtomicLoadInt8 : kAtomicLoadUint8;
       break;
@@ skipping 71 matching lines @@
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   return MachineOperatorBuilder::AlignmentRequirements::
       FullUnalignedAccessSupport();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8