Update header comment on AliasStrings.java
@@ -38,10 +38,13 @@ import java.util.regex.Pattern;
* applications. Strings that should be aliased occur many times in the code,
* or occur on codepaths that get executed frequently.
*
- * 2016/05/04 Note: This pass addressed some performance problems in older
- * browser VMs, which don't happen on modern VMs. Turning on the pass usually
- * hurts code size after gzip, so we no longer recommend it. At some point we
- * will probably delete it.
+ * 2017/09/17 Notes:
+ * - Turning on this pass usually hurts code size after gzip.
+ * - It was originally written to deal with performance problems on some
+ * older browser VMs.
+ * - However, projects that make heavy use of jslayout may need to enable
+ * this pass even for modern browsers, because jslayout generates so many
+ * duplicate strings.
*
*/
class AliasStrings extends AbstractPostOrderCallback
