[8u40] Request for approval: 8060483: NPE with explicitCastArguments unboxing null

[Vladimir Ivanov]

Please, approve backport of the following fix into 8u40:

8060483: NPE with explicitCastArguments unboxing null
https://jbs.oracle.com/bugs/browse/JDK-8060483
http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/52a0226d6a84
http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-October/029154.html

The changes apply cleanly.

Thanks!

Best regards,
Vladimir Ivanov