[jdk17u-dev] RFR: 8318986: Improve GenericWaitBarrier performance [v2]

[Aleksey Shipilev]

> Clean backport to drastically improve safepoint performance under heavy load, fixing regression between JDK 11 and JDK 17.
> 
> Additional testing:
>  - [x] Ad-hoc performance runs, expected improvements
>  - [x] MacOS AArch64 server fastdebug, `tier{1,2,3}`

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 three additional commits since the last revision:

 - Merge branch 'master' into JDK-8318986-generic-wait-barrier
 - Merge branch 'master' into JDK-8318986-generic-wait-barrier
 - Backport 30462f9da40d3a7ec18fcf46e2154fabb5fd4753

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/2041/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/2041/files/5db67531..6a7c9ca7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2041&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2041&range=00-01

  Stats: 38087 lines in 1057 files changed: 15394 ins; 19097 del; 3596 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2041.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2041/head:pull/2041

PR: https://git.openjdk.org/jdk17u-dev/pull/2041