Backporting the TCP Loopack fast path (Windows) improvement to JDK 8

[Martin Sawicki (MS OPEN TECH)]

Hello,

We'd like to propose to backport our TCP loopback fast path improvement for Windows that was recently accepted into JDK9 to JDK8:
(JDK9 fix for reference: http://hg.openjdk.java.net/jdk9/dev/jdk/rev/26e6402772c8)

Our suggested JDK8 webrev package can be found here:
https://openjdkcontrib.blob.core.windows.net/tcploopback/jdk8-webrev-20141105.zip

We'd appreciate your review and acceptance of this contribution.

Best regards,
Martin Sawicki (and Kirk Shoop, and Valeriy Kopylov)
Microsoft Open Technologies, Inc.