RFR: 8293622: Cleanup use of G1ConcRefinementThreads [v2]

[Lei Zaakjyu]

> 8293622: Cleanup use of G1ConcRefinementThreads

Lei Zaakjyu has updated the pull request incrementally with one additional commit since the last revision:

  fix

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17080/files
  - new: https://git.openjdk.org/jdk/pull/17080/files/c669aed9..2dcedef0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17080&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17080&range=00-01

  Stats: 4 lines in 2 files changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17080.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17080/head:pull/17080

PR: https://git.openjdk.org/jdk/pull/17080