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

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 1276 matching lines @@
        g.UseFixed(node->InputAt(0), d1),
        g.UseFixed(node->InputAt(1), d2))->MarkAsCall();
 }
 
 
 void InstructionSelector::VisitFloat32Max(Node* node) { UNREACHABLE(); }
 
 
 void InstructionSelector::VisitFloat64Max(Node* node) { UNREACHABLE(); }
 
+void InstructionSelector::VisitFloat64SilenceNaN(Node* node) {
+  VisitRR(this, kPPC_Float64SilenceNaN, node);
+}
+
 
 void InstructionSelector::VisitFloat32Min(Node* node) { UNREACHABLE(); }
 
 
 void InstructionSelector::VisitFloat64Min(Node* node) { UNREACHABLE(); }
 
 
 void InstructionSelector::VisitFloat32Abs(Node* node) {
   VisitRR(this, kPPC_AbsDouble | MiscField::encode(1), node);
 }
@@ skipping 703 matching lines @@
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   return MachineOperatorBuilder::AlignmentRequirements::
       FullUnalignedAccessSupport();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8