RFR (XS): 8027553 - Change the in_cset_fast_test functionality to use the G1BiasedArray abstraction

[Thomas Schatzl]

Hi all,

  can I have reviews for the following small change? It cleans up the
in_cset_fast_test functionality to use the G1BiasedMappedArray
abstraction introduced long ago.

This removes lots of clutter in the code caused by lots of explanation
that is part of the G1BiasedMappedArray class description, manual
management and asserts all handled by that class.

It is intentional to name the class handling the in_cset_fast_test type
G1FastCSetBiasedMappedArray, and not e.g. BoolBiasedMappedArray. The
plan is to extend its use for "JDK-8027959: Investigate early
reclamation of large objects in G1".

Webrev:
http://cr.openjdk.java.net/~tschatzl/8027553/webrev/

CR:
https://bugs.openjdk.java.net/browse/JDK-8027553

Testing:
jprt

Thanks,
  Thomas