[8u40] Request for approval: 8028539: Endless loop in native code of sun.java2d.loops.ScaledBlit

[Phil Race]

Please approval the identical backport of the fix for
Bug: https://bugs.openjdk.java.net/browse/JDK-8028539
JDK9 review thread: 
http://mail.openjdk.java.net/pipermail/2d-dev/2014-October/004916.html
JDK9 webrev : http://cr.openjdk.java.net/~prr/8028539.1 
<http://cr.openjdk.java.net/%7Eprr/8028539.1/>
Identical JDK8u fix : / 
<http://cr.openjdk.java.net/%7Eprr/8028539.1/>http://cr.openjdk.java.net/~prr/8028539.8u/

-phil.