RFR(XS): 8134738: Remove CollectorPolicy::Name

[Per Liden]

Hi,

Please review this small cleanup, which removes the unused 
CollectorPolicy::Name enum and the related kind() functions. They are 
not used by the SA either, so it's unaffected.

Webrev: http://cr.openjdk.java.net/~pliden/8134738/webrev.0/

Bug: https://bugs.openjdk.java.net/browse/JDK-8134738

cheers,
/Per