8049420: Backout 8048248 to correct attribution

[Stefan Karlsson]

Hi all,

I missed adding Mikael Gerding to the Contributed-by line of the G1 
Class Unloading change. Since it's a rather large contribution we we're 
going to do a little dance to get it right:

The following change has already been pushed:
  8048248: G1 Class Unloading after completing a concurrent mark cycle

We'll do a backout that Bengt and Erik have already reviewed:
  Backout: 8049420: Backout 8048248 to correct attribution

Then exactly the same changeset with the correct attribution will be 
resubmitted as:
  8049421: G1 Class Unloading after completing a concurrent mark cycle

thanks,
StefanK