hg: jdk/submit: 8224849: Flag (?U:...) is allowed for non-capturing groups

[ivan.gerasimov at oracle.com]

Changeset: 1e63cdb2b2ba
Author:    igerasim
Date:      2019-06-25 18:20 -0700
URL:       http://hg.openjdk.java.net/jdk/submit/rev/1e63cdb2b2ba

8224849: Flag (?U:...) is allowed for non-capturing groups
Reviewed-by: bchristi

! src/java.base/share/classes/java/util/regex/Pattern.java