Make sure that canonical NaN is also platform NaN.

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 5d79b84bd4407fb69beed05751c2f10034f82935..fbd808958044611bcd93ac4e77a53c07a07bcf28 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -71,8 +71,7 @@ const double DoubleConstant::one_half = 0.5;
 const double DoubleConstant::minus_zero = -0.0;
 const double DoubleConstant::uint8_max_value = 255;
 const double DoubleConstant::zero = 0.0;
-const double DoubleConstant::canonical_non_hole_nan =
-    BitCast<double>(kCanonicalNonHoleNanInt64);
+const double DoubleConstant::canonical_non_hole_nan = OS::nan_value();
 const double DoubleConstant::the_hole_nan = BitCast<double>(kHoleNanInt64);
 const double DoubleConstant::negative_infinity = -V8_INFINITY;
 const char* RelocInfo::kFillerCommentString = "DEOPTIMIZATION PADDING";