[jdk17u-dev] RFR: 8283566: G1: Improve G1BarrierSet::enqueue performance [v4]

[Aleksey Shipilev]

> Clean (after #905) backport to improve G1 performance.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `tier1`
>  - [x] Linux x86_64 fastdebug `tier2`
>  - [x] Linux x86_64 fastdebug `tier3`

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into JDK-8283566-g1-enqueue-perf
 - Backport 6ebf845ff7d758c99367488818427fcb7a5dbda9

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/906/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/906/files/8538bcba..e9e49d79

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=906&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=906&range=02-03

  Stats: 2455 lines in 322 files changed: 1984 ins; 210 del; 261 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/906.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/906/head:pull/906

PR: https://git.openjdk.org/jdk17u-dev/pull/906