Make SNaN verification universal for all arches.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 31439039de15f1506e13b117c2a56dd0b6109ac4..440b6934f3d43d10e201a5df97d3d626a7da3ae4 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2335,7 +2335,7 @@ void FixedDoubleArray::set(int index, double value) {
          map() != GetHeap()->fixed_array_map());
   int offset = kHeaderSize + index * kDoubleSize;
   if (std::isnan(value)) {
-    WRITE_UINT64_FIELD(this, offset, V8_UINT64_C(0xFFFFFFFFFFFFFFFF));
+    WRITE_DOUBLE_FIELD(this, offset, std::numeric_limits<double>::quiet_NaN());
   } else {
     WRITE_DOUBLE_FIELD(this, offset, value);
   }