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

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 289730cabaafa82c137347630123d4eea757c9c7..5d571a9be807656d2ba38d79e5ae5670f8044de0 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -1558,6 +1558,10 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       }
       break;
     }
+    case kSSEFloat64SilenceNaN:
+      __ Xorpd(kScratchDoubleReg, kScratchDoubleReg);
+      __ Subsd(i.InputDoubleRegister(0), kScratchDoubleReg);
+      break;
     case kX64Movsxbl:
       ASSEMBLE_MOVX(movsxbl);
       __ AssertZeroExtended(i.OutputRegister());