RFR: JDK-8180193: Make marking bitmap code available to other GCs

[Roman Kennke]

Am 24.08.2018 um 14:15 schrieb Aleksey Shipilev:
> On 08/24/2018 01:51 PM, Roman Kennke wrote:
>> This moves marking bitmap code to gc/shared, at least the parts that are
>> not G1 specific. The only minor functional change is in check_mark():
>> replace is_in_exact() with is_in_reserved(). If that is not ok, then we
>> may want to introduce virtual is_in_exact() in CollectedHeap?
>>
>> Bug:
>> https://bugs.openjdk.java.net/browse/JDK-8180193
>> Webrev:
>> http://cr.openjdk.java.net/~rkennke/JDK-8180193/webrev.00/
> 
> *) Stray file:
>   src/hotspot/share/gc/shared/concurrentMarkBitMap.hpp~
> 
> *) Do we really need to call it *concurrent*MarkBitMap? I think shorter markBitMap is enough.
> 
> *) Ditto for the class name. It seems MarkBitMap is enough.
> 
Thanks Aleksey for reviewing. I fixed all of the above:

http://cr.openjdk.java.net/~rkennke/JDK-8180193/webrev.01/