Use signaling NaN for holes in fixed double arrays.

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Because standalone V8 builds are not supported, assume this is part of a
 # Chromium build.
 import("//build/module_args/v8.gni")
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
@@ skipping 1271 matching lines @@
     "src/base/division-by-constant.cc",
     "src/base/division-by-constant.h",
     "src/base/flags.h",
     "src/base/functional.cc",
     "src/base/functional.h",
     "src/base/iterator.h",
     "src/base/lazy-instance.h",
     "src/base/logging.cc",
     "src/base/logging.h",
     "src/base/macros.h",
+    "src/base/math.cc",
+    "src/base/math.h",
     "src/base/once.cc",
     "src/base/once.h",
     "src/base/platform/elapsed-timer.h",
     "src/base/platform/time.cc",
     "src/base/platform/time.h",
     "src/base/platform/condition-variable.cc",
     "src/base/platform/condition-variable.h",
     "src/base/platform/mutex.cc",
     "src/base/platform/mutex.h",
     "src/base/platform/platform.h",
@@ skipping 227 matching lines @@
       sources += [
         "src/d8-debug.cc",
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }