RFR: JDK-8022554 -- Fix Warnings in sun.invoke.anon Package

[Dan Xu]

Hi All,

Please review the simple warning fix in 
src/share/classes/sun/invoke/anon/ConstantPoolPatch.java.

webrev: http://cr.openjdk.java.net/~dxu/8022554/webrev/

Thanks,

-Dan