Added tag jdk8-b21 for changeset 664fa4fb0ee4
diff --git a/.hgtags b/.hgtags
index a0cd200..58e1636 100644
--- a/.hgtags
+++ b/.hgtags
@@ -142,3 +142,4 @@
 334bd51fb3f321cd6777416ae7bafac71a84140a jdk8-b18
 3778f85773055e81eab6c5ef828935ecca241810 jdk8-b19
 39e938cd1b82ec3aab0a9aa66fd8a0457cd0c9c2 jdk8-b20
+664fa4fb0ee411ef048903c479f8b962fcdb2f4b jdk8-b21