RFR (XXS): 8039596: Remove HeapRegionRemSet::clear_incoming_entry()

[Thomas Schatzl]

Hi all,

  can I have reviews for the following cleanup that simply removes above
method?

It has not been used anywhere for apparently a long time, so it seems
somewhat out of date as it does not cover sparse entries.

This, depending on the caller which is not there any more, might not be
problematic, but nevertheless it does not seem useful to keep it any
longer.

CR
https://bugs.openjdk.java.net/browse/JDK-8039596

Webrev:
http://cr.openjdk.java.net/~tschatzl/8039596/webrev/

Thanks,
  Thomas