RFR: 8035393: Use CLDClosure instead of CLDToOopClosure in frame::oops_interpreted_do

[Stefan Karlsson]

Hi all,

Please, review this patch to change the closure type used in 
frame::oops_interpreted_do from CLDToOopClosure to CLDClosure, which is 
an abstract base class of CLDToOopClosure.

We need this for the G1 Class Unloading project, to be able to 
specialize the CLD scanning code during the Initial Mark phase.

http://cr.openjdk.java.net/~stefank/8035393/webrev.00/

thanks,
StefanK