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

src/compiler/arm64/instruction-scheduler-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-scheduler.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 113 matching lines @@
     case kArm64Uint32ToFloat32:
     case kArm64Uint32ToFloat64:
     case kArm64Uint64ToFloat32:
     case kArm64Uint64ToFloat64:
     case kArm64Float64ExtractLowWord32:
     case kArm64Float64ExtractHighWord32:
     case kArm64Float64InsertLowWord32:
     case kArm64Float64InsertHighWord32:
     case kArm64Float64MoveU64:
     case kArm64U64MoveFloat64:
+    case kArm64Float64SilenceNaN:
       return kNoOpcodeFlags;
 
     case kArm64TestAndBranch32:
     case kArm64TestAndBranch:
     case kArm64CompareAndBranch32:
     case kArm64CompareAndBranch:
       return kIsBlockTerminator;
 
     case kArm64LdrS:
     case kArm64LdrD:
@@ skipping 191 matching lines @@
       return 5;
 
     default:
       return 2;
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8