Invalidate defaultObjects if timezone changes

src/runtime/runtime-date.cc

Index: src/runtime/runtime-date.cc
diff --git a/src/runtime/runtime-date.cc b/src/runtime/runtime-date.cc
index 96292ad1c5fb50fbab87ab530d15923c070bf6a5..bea5562d464af8b1e426f26e33010cac239f8e5d 100644
--- a/src/runtime/runtime-date.cc
+++ b/src/runtime/runtime-date.cc
@@ -36,5 +36,26 @@ RUNTIME_FUNCTION(Runtime_DateCurrentTime) {
   return *isolate->factory()->NewNumber(JSDate::CurrentTimeValue(isolate));
 }
 
+RUNTIME_FUNCTION(Runtime_DateCacheVersion) {

[Dan Ehrenberg, 2016/05/18 17:39:57]

If this is only used by Intl, better to put it in runtime-i18n.cc

[pgorszkowski, 2016/05/20 13:14:00]

Done.

+  HandleScope scope(isolate);
+  DCHECK_EQ(0, args.length());
+  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);
+    date_cache_version->set(0, Smi::FromInt(0));
+    isolate->eternal_handles()->CreateSingleton(
+        isolate, *date_cache_version, EternalHandles::DATE_CACHE_VERSION);
+  }
+  Handle<FixedArray> date_cache_version =
+      Handle<FixedArray>::cast(isolate->eternal_handles()->GetSingleton(
+          EternalHandles::DATE_CACHE_VERSION));
+  // Return result as a JS array.
+  Handle<JSObject> result =
+      isolate->factory()->NewJSObject(isolate->array_function());

[Dan Ehrenberg, 2016/05/18 17:39:57]

Why is this wrapped in an array, rather than just returning the first element,
if that is all that's used?

[pgorszkowski, 2016/05/19 11:07:57]

Currently it is kept as FixedArray, should we change it too? What kind of
'Object' should it be - any suggestions?

+  JSArray::SetContent(Handle<JSArray>::cast(result), date_cache_version);
+  return *result;
+}
+
 }  // namespace internal
 }  // namespace v8