Use clean_comment_cache() in wp_insert_comment().

Previously, only the 'last_changed' incrementor was manually invalidated, since
the newly created comment did not yet exist in the cache. However, this created
an inconsistency with the other comment CRUD functions, which result in the
'clean_comment_cache' action firing.

Props spacedmonkey.
See #36906.
Built from https://develop.svn.wordpress.org/trunk@37614


git-svn-id: http://core.svn.wordpress.org/trunk@37582 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment.php

@@ -1588,6 +1588,9 @@ function wp_insert_comment( $commentdata ) {
 	if ( $comment_approved == 1 ) {
 		wp_update_comment_count( $comment_post_ID );
 	}
+
+	clean_comment_cache( $id );
+
 	$comment = get_comment( $id );
 
 	// If metadata is provided, store it.
@@ -1607,8 +1610,6 @@ function wp_insert_comment( $commentdata ) {
 	 */
 	do_action( 'wp_insert_comment', $id, $comment );
 
-	wp_cache_set( 'last_changed', microtime(), 'comment' );
-
 	return $id;
 }