Replace our home-grown BitCast with bit_cast from Chrome/Google3.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 4834ef2033efc6171bdfad24722d00e6fcf03c55..f9136f810cb1b14b31af489992e622e4c7363415 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -371,9 +371,9 @@ void FixedDoubleArray::FixedDoubleArrayVerify() {
     if (!is_the_hole(i)) {
       double value = get_scalar(i);
       CHECK(!std::isnan(value) ||
-             (BitCast<uint64_t>(value) ==
-              BitCast<uint64_t>(canonical_not_the_hole_nan_as_double())) ||
-             ((BitCast<uint64_t>(value) & Double::kSignMask) != 0));
+            (bit_cast<uint64_t>(value) ==
+             bit_cast<uint64_t>(canonical_not_the_hole_nan_as_double())) ||
+            ((bit_cast<uint64_t>(value) & Double::kSignMask) != 0));
     }
   }
 }