request for review: 8033294: javac, spurious warning for instanceof operator

[Vicente-Arturo Romero-Zaldivar]

Hello,

Please review this patch, to eliminate a spurious warning generated by 
the compiler for the instanceof operator.

The webrev is here:
http://cr.openjdk.java.net/~vromero/8033294/webrev.01/

The bug report is here:
https://bugs.openjdk.java.net/browse/JDK-8033294

Thanks,
Vicente