[jdk17u-dev] RFR: 8283566: G1: Improve G1BarrierSet::enqueue performance [v2]

[Aleksey Shipilev]

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

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.

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Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/906/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/906/files/02f6685c..02f6685c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=906&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=906&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 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