RFR: 8343189: [REDO] JDK-8295269 G1: Improve slow startup due to predictor initialization [v2]

[Thomas Schatzl]

> Hi all,
> 
>   please review this redo of [JDK-8295269](https://bugs.openjdk.org/browse/JDK-8295269) G1: Improve slow startup due to predictor initialization. The cause are issues with the `runtime/cds/DeterministicDump.java` test, that is currently being fixed in #21871.
> 
> There has been no change in these changes.
> 
> Testing: running a few thousand times with the fixed `runtime/cds/DeterministicDump.java` test
> 
> Thanks,
>   Thomas

Thomas Schatzl 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 8343189-redo-slow-startup
 - Revert "8343086: [BACKOUT] JDK-8295269 G1: Improve slow startup due to predictor initialization"
   
   This reverts commit f1cc890ddfe2e472cf786856dc7d01645f61b054.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21876/files
  - new: https://git.openjdk.org/jdk/pull/21876/files/4ee7c256..f728668c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21876&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21876&range=00-01

  Stats: 116898 lines in 366 files changed: 93329 ins; 7618 del; 15951 mod
  Patch: https://git.openjdk.org/jdk/pull/21876.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21876/head:pull/21876

PR: https://git.openjdk.org/jdk/pull/21876