Deprecate $wgMemc

Callers should use the LocalServerObjectCache service instead.

Bug: T160813
Change-Id: I0f9725a56413b85929f920542bf89928e719baac

RELEASE-NOTES-1.35

@@ -288,6 +288,8 @@ because of Phabricator reports.
 * As part of dropping security support for IE 6 and IE 7,
   WebRequest::checkUrlExtension() has been deprecated, and now always returns
   true.
+* $wgMemc is deprecated, use
+  MediaWikiServices::getInstance()->getLocalServerObjectCache() instead.
 * …
 
 === Other changes in 1.35 ===

includes/Setup.php

@@ -749,6 +749,10 @@ if ( $wgCommandLineMode ) {
 	wfDebug( $debug );
 }
 
+/**
+ * @var BagOStuff $wgMemc
+ * @deprecated since 1.35, use the LocalServerObjectCache service instead
+ */
 $wgMemc = ObjectCache::getLocalClusterInstance();
 $messageMemc = wfGetMessageCacheStorage();