[8u40] Request for approval for CR 8049244 - XML Signature performance issue caused by unbuffered signature data

[Sean Mullan]

This is a request to backport a jdk9 fix into jdk8u-dev.

1. bug: https://bugs.openjdk.java.net/browse/JDK-8049244

2. JDK 9 changeset: http://hg.openjdk.java.net/jdk9/dev/jdk/rev/ffef6db15d92

3. public review thread: 
http://mail.openjdk.java.net/pipermail/security-dev/2014-July/010738.html

Thanks,
Sean