Follows I660679a4.
Change-Id: I65bde4f0f6939c9a1e3e06dcbdbf9856e4416df9
&$redirectParams: An array of parameters preserved by redirecting special pages.
'RejectParserCacheValue': Return false to reject an otherwise usable
-cached value from the Parser cache.
+cached value from the Parser cache. NOTE: CARELESS USE OF THIS HOOK CAN
+HAVE CATASTROPHIC CONSEQUENCES FOR HIGH-TRAFFIC INSTALLATIONS. USE WITH
+EXTREME CARE.
$parserOutput: ParserOutput value.
$wikiPage: WikiPage object.
$parserOptions: ParserOptions object.