[8u20] Request for approval: JDK-8041998: RegExp implementation is not thread-safe

[Hannes Wallnoefer]

Hi,

Please approve backport to jdk8u20 of JDK-8041998: RegExp implementation 
is not thread-safe.

Bug: https://bugs.openjdk.java.net/browse/JDK-8041998
Webrev: http://cr.openjdk.java.net/~hannesw/8041998/
JDK9 changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/6321f565a7b1
Review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-May/002948.html

The patch applies to 8u20 without changes.

Thanks,
Hannes