RFR [Urgent] [Backout] JDK-8196602 Change HeapRegionClosure to comply to naming conventions

[Thomas Schatzl]

Hi all,

  I accidentally pushed JDK-8196602 to the jdk/jdk10 tree a few minutes
ago. This is the backout.

CR:
https://bugs.openjdk.java.net/browse/JDK-8197493
Webrev:
http://cr.openjdk.java.net/~tschatzl/8197493/webrev/

(Original webrev:
http://cr.openjdk.java.net/~tschatzl/8196602/webrev )

I am awfully sorry for that.

Thanks,
  Thomas