git: openjdk/jdk16: 8258259: Unicode linebreak matching behavior is incorrect; backout JDK-8235812

[Stuart Marks]

Changeset: cbc3feeb
Author:    Stuart Marks <smarks at openjdk.org>
Date:      2020-12-18 00:36:33 +0000
URL:       https://git.openjdk.java.net/jdk16/commit/cbc3feeb

8258259: Unicode linebreak matching behavior is incorrect; backout JDK-8235812

Reviewed-by: naoto

! src/java.base/share/classes/java/util/regex/Pattern.java
! test/jdk/java/util/regex/RegExTest.java