RFR: 8284995: G1: Do not mark through Closed Archive regions during concurrent mark [v2]

[Thomas Schatzl]

> Hi all,
> 
>   please review this change that skips CA regions during concurrent mark. This is achieved by keeping the ntams at bottom for these regions.
> G1 Full GC already skips marking of CA regions.
> 
> Testing: tier1-5
> 
> Thanks,
>   Thomas

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

  iwalulya review, fix typo

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8315/files
  - new: https://git.openjdk.java.net/jdk/pull/8315/files/9dd0d681..e2c7edb8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8315&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8315&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8315.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8315/head:pull/8315

PR: https://git.openjdk.java.net/jdk/pull/8315