[8u-dev] Request for Review and Approval to backport: 8165243: Base64.Encoder.wrap(os).write(byte[], int, int) with incorrect arguments should not produce output

[Ivan Gerasimov]

Hello!

I'd like to backport this fix to jdk8u.

The unshuffled fix applies almost clearly: I only had to slightly modify 
the regression test.

Bug: https://bugs.openjdk.java.net/browse/JDK-8165243
Jdk9 change: http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/a81f30fb7d8c
Jdk9 review: 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2016-September/043266.html
Jdk8u webrev: http://cr.openjdk.java.net/~igerasim/8165243/03/webrev/

Would you please help review the change and approve the backport?

Thanks in advance,
Ivan