objectcache: Fix DI for MultiWriteBagOStuff sub caches
Follows-up Ia893ddb36427eb5, which added unreachable code because
is_subclass_of is strictly for matching subclasses.
Test plan:
* Add the following to your LocalSettings:
$wgParserCacheType = 'mysql-multiwrite';
$wgObjectCaches['mysql-multiwrite'] = [
'class' => 'MultiWriteBagOStuff',
'caches' => [
0 => [
'factory' => [ 'ObjectCache', 'getInstance' ],
'args' => [ CACHE_DB ]
],
1 => [
'class' => SqlBagOStuff::class,
'loggroup' => 'SQLBagOStuff',
'server' => [
'type' => 'sqlite',
'dbname' => 'wikicache',
'tablePrefix' => '',
'variables' => [ 'synchronous' => 'NORMAL' ],
'dbDirectory' => $wgSQLiteDataDir,
'trxMode' => 'IMMEDIATE',
'flags' => 0
]
],
],
'replication' => 'async',
];
* Main_Page fatals without this patch, renders with.
Bug: T327158
Change-Id: I59266726ad72e78c9f99d3cc8f9c8838fabed3b5
4e596f5112