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

src/compiler/arm/code-generator-arm.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/code-generator.h"
 
 #include "src/arm/macro-assembler-arm.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 1234 matching lines @@
     case kArmFloat64Min: {
       CpuFeatureScope scope(masm(), ARMv8);
       // (a < b) ? a : b
       DwVfpRegister a = i.InputFloat64Register(0);
       DwVfpRegister b = i.InputFloat64Register(1);
       DwVfpRegister result = i.OutputFloat64Register(0);
       __ VFPCompareAndSetFlags(b, a);
       __ vsel(gt, result, a, b);
       break;
     }
+    case kArmFloat64SilenceNaN: {
+      DwVfpRegister value = i.InputFloat64Register(0);
+      DwVfpRegister result = i.OutputFloat64Register(0);
+      __ VFPCanonicalizeNaN(result, value);
+      break;
+    }
     case kArmPush:
       if (instr->InputAt(0)->IsFPRegister()) {
         LocationOperand* op = LocationOperand::cast(instr->InputAt(0));
         if (op->representation() == MachineRepresentation::kFloat64) {
           __ vpush(i.InputFloat64Register(0));
           frame_access_state()->IncreaseSPDelta(kDoubleSize / kPointerSize);
         } else {
           DCHECK_EQ(MachineRepresentation::kFloat32, op->representation());
           __ vpush(i.InputFloat32Register(0));
           frame_access_state()->IncreaseSPDelta(1);
@@ skipping 533 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8