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

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

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index a7e5e387e1fdf427867f380d61eba2b50c28b5f0..8108b86d808faf246d5b80f9ed05de640204e1e4 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -1164,6 +1164,10 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       __ 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;