Do not use eternal handles when creating a start-up snapshot.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/984833003

Cr-Commit-Position: refs/heads/master@{#27045}

src/date.js

@@ -731,6 +731,7 @@ var date_cache_version = NAN;
 function CheckDateCacheCurrent() {
   if (!date_cache_version_holder) {
     date_cache_version_holder = %DateCacheVersion();
+    if (!date_cache_version_holder) return;
   }
   if (date_cache_version_holder[0] == date_cache_version) {
     return;

src/runtime/runtime-date.cc

@@ -152,6 +152,7 @@ RUNTIME_FUNCTION(Runtime_DateToUTC) {
 RUNTIME_FUNCTION(Runtime_DateCacheVersion) {
   HandleScope hs(isolate);
   DCHECK(args.length() == 0);
+  if (isolate->serializer_enabled()) return isolate->heap()->undefined_value();
   if (!isolate->eternal_handles()->Exists(EternalHandles::DATE_CACHE_VERSION)) {
     Handle<FixedArray> date_cache_version =
         isolate->factory()->NewFixedArray(1, TENURED);