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

src/compiler/x64/instruction-scheduler-x64.cc

 // Copyright 2015 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-scheduler.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 86 matching lines @@
     case kSSEInt64ToFloat64:
     case kSSEUint64ToFloat32:
     case kSSEUint64ToFloat64:
     case kSSEUint32ToFloat64:
     case kSSEUint32ToFloat32:
     case kSSEFloat64ExtractLowWord32:
     case kSSEFloat64ExtractHighWord32:
     case kSSEFloat64InsertLowWord32:
     case kSSEFloat64InsertHighWord32:
     case kSSEFloat64LoadLowWord32:
+    case kSSEFloat64SilenceNaN:
     case kAVXFloat32Cmp:
     case kAVXFloat32Add:
     case kAVXFloat32Sub:
     case kAVXFloat32Mul:
     case kAVXFloat32Div:
     case kAVXFloat32Max:
     case kAVXFloat32Min:
     case kAVXFloat64Cmp:
     case kAVXFloat64Add:
     case kAVXFloat64Sub:
@@ skipping 69 matching lines @@
 
 
 int InstructionScheduler::GetInstructionLatency(const Instruction* instr) {
   // TODO(all): Add instruction cost modeling.
   return 1;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8