LibLocale: Decide to skip parsing CLDR calendars a little earlier

We currently parse each CLDR calendar, then decide based on its primary
key whether we want to skip it. Instead, we can decide to skip it based
on its file name.

This reduces the runtime of GenerateLocaleData from 2.03s to 1.97s.

Meta/Lagom/Tools/CodeGenerators/LibLocale/GenerateLocaleData.cpp

@@ -833,12 +833,17 @@ static ErrorOr<void> parse_calendar_keywords(DeprecatedString locale_dates_path,
     KeywordList keywords {};
 
     TRY(Core::Directory::for_each_entry(locale_dates_path, Core::DirIterator::SkipParentAndBaseDir, [&](auto& entry, auto& directory) -> ErrorOr<IterationDecision> {
-        auto locale_calendars_path = LexicalPath::join(directory.path().string(), entry.name).string();
+        if (!entry.name.starts_with("ca-"sv))
+            return IterationDecision::Continue;
 
-        LexicalPath calendars_path(move(locale_calendars_path));
-        if (!calendars_path.basename().starts_with("ca-"sv))
+        // The generic calendar is not a supported Unicode calendar key, so skip it:
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/calendar#unicode_calendar_keys
+        if (entry.name == "ca-generic.json"sv)
             return IterationDecision::Continue;
 
+        auto locale_calendars_path = LexicalPath::join(directory.path().string(), entry.name).string();
+        LexicalPath calendars_path(move(locale_calendars_path));
+
         auto calendars = TRY(read_json_file(calendars_path.string()));
         auto const& main_object = calendars.as_object().get_object("main"sv).value();
         auto const& locale_object = main_object.get_object(calendars_path.parent().basename()).value();
@@ -846,11 +851,6 @@ static ErrorOr<void> parse_calendar_keywords(DeprecatedString locale_dates_path,
         auto const& calendars_object = dates_object.get_object("calendars"sv).value();
 
         calendars_object.for_each_member([&](auto calendar_name, JsonValue const&) {
-            // The generic calendar is not a supported Unicode calendar key, so skip it:
-            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/calendar#unicode_calendar_keys
-            if (calendar_name == "generic"sv)
-                return;
-
             if (auto calendar_alias = find_keyword_alias("ca"sv, calendar_name, cldr); calendar_alias.has_value())
                 calendar_name = calendar_alias.release_value();