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

src/compiler/ia32/code-generator-ia32.cc

 // Copyright 2013 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/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1124 matching lines @@
       break;
     }
     case kAVXFloat64Neg: {
       // TODO(bmeurer): Use RIP relative 128-bit constants.
       __ pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
       __ psllq(kScratchDoubleReg, 63);
       CpuFeatureScope avx_scope(masm(), AVX);
       __ vxorpd(i.OutputDoubleRegister(), kScratchDoubleReg, i.InputOperand(0));
       break;
     }
+    case kSSEFloat64SilenceNaN:
+      __ xorpd(kScratchDoubleReg, kScratchDoubleReg);
+      __ subsd(i.InputDoubleRegister(0), kScratchDoubleReg);
+      break;
     case kIA32Movsxbl:
       __ movsx_b(i.OutputRegister(), i.MemoryOperand());
       break;
     case kIA32Movzxbl:
       __ movzx_b(i.OutputRegister(), i.MemoryOperand());
       break;
     case kIA32Movb: {
       size_t index = 0;
       Operand operand = i.MemoryOperand(&index);
       if (HasImmediateInput(instr, index)) {
@@ skipping 828 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8