Use signaling NaN for holes in fixed double arrays.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 6242ef02af63074515cd036e845bd75556b4d39b..eef688e09846d176bbba01f8f96fe3ac4adb69be 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -4,6 +4,7 @@
 
 #include "src/v8.h"
 
+#include "src/base/math.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/heap/objects-visiting.h"
@@ -389,11 +390,8 @@ void FixedArray::FixedArrayVerify() {
 void FixedDoubleArray::FixedDoubleArrayVerify() {
   for (int i = 0; i < length(); i++) {
     if (!is_the_hole(i)) {
-      double value = get_scalar(i);
-      CHECK(!std::isnan(value) ||
-            (bit_cast<uint64_t>(value) ==
-             bit_cast<uint64_t>(canonical_not_the_hole_nan_as_double())) ||
-            ((bit_cast<uint64_t>(value) & Double::kSignMask) != 0));
+      double const value = get_scalar(i);
+      CHECK(!std::isnan(value) || base::IsQuietNaN(value));
     }
   }
 }