RFR (XXS): 8135327: C1 for arm* should support conditional card marking

[Thomas Schatzl]

Hi all,

  can I have review for the tiny interface change to add support for
conditional card marking for the ARM ports? The changeset only adds some
method declaration to the interface.

CR:
https://bugs.openjdk.java.net/browse/JDK-8135327
Webrev:
http://cr.openjdk.java.net/~tschatzl/8135327/webrev/
Testing:
jprt, vm.gc

Thanks,
  Thomas