[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 69c16a0faaf03f5a8e852223316034941caf63fb..673cbebbb69186a16225b166fb055014fb7118c4 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -1142,6 +1142,10 @@ 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;