Index: wp-includes/comment.php
===================================================================
--- wp-includes/comment.php	(revision 25563)
+++ wp-includes/comment.php	(working copy)
@@ -231,6 +231,8 @@
 			'post_name' => '',
 			'post_parent' => '',
 			'post_status' => '',
+			'comment__in' => array(),
+			'comment__not_in' => array(),
 			'post_type' => '',
 			'status' => '',
 			'type' => '',
@@ -349,6 +351,13 @@
 		} elseif ( ! empty( $type ) ) {
 			$where .= $wpdb->prepare( ' AND comment_type = %s', $type );
 		}
+		if ( ! empty( $comment__in ) ) {
+			$comment__in = implode( ',', array_map( 'absint', $comment__in ) );
+			$where .= " AND {$wpdb->comments}.comment_ID IN ($comment__in)";
+		} elseif ( ! empty( $comment__not_in ) ) {
+			$comment__not_in = implode( ',', array_map( 'absint', $comment__not_in ) );
+			$where .= " AND {$wpdb->comments}.comment_ID NOT IN ($comment__not_in)";
+		} 
 		if ( '' !== $parent )
 			$where .= $wpdb->prepare( ' AND comment_parent = %d', $parent );
 		if ( '' !== $user_id )