RFR: 8280958: G1/Parallel: Unify marking code structure [v2]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this change that makes G1 and Parallel Full GC marking code structure a bit more similar both terms of structure as well as naming?
> 
> This allows easier comparison and unless we are going to really merge them easier to do changes. They are still a bit different for several reasons:
>   * G1 Full GC can disable class unloading while Parallel Full GC always unloads classes
>   * different code structure in calls: Parallel GC drains the task queues after every kind of root, G1 only does at the end of all roots
>   * root processing between the two collectors is very different
> 
> All these are potential follow-ups.
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  Indentation fixes

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7561/files
  - new: https://git.openjdk.java.net/jdk/pull/7561/files/4708cc6b..87a8c4e7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7561&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7561&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7561.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7561/head:pull/7561

PR: https://git.openjdk.java.net/jdk/pull/7561