[jdk20u] RFR: 8306825: Monitor deflation might be accidentally disabled by zero intervals [v2]

[Aleksey Shipilev]

> Clean backport to improve both new code for `GuaranteedAsyncDeflationInterval`, but also handles bugs in existing intervals handling.
> 
> Additional testing:
>  - [x] macos-aarch64-server-fastdebug, `runtime/Monitor`
>  - [x] Linux x86_64 fastdebug, `tier1 tier2 tier3`
>  - [x] Linux AArch64 fastdebug, `tier1 tier2 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 five additional commits since the last revision:

 - Merge branch 'master' of https://git.openjdk.org/jdk20u into JDK-8306825-deflation-zero-intervals
 - Backport a6b4f25bd50e6861281d162f143c5bc9c16bac51
 - Backport 9ad6dc881d285cc26c136f0ef19af5bac0a75022
 - Merge branch 'master' into JDK-8305994-guarantee-async-deflation
 - Backport 6b81342c2215041dbb7e9020a67cdc56976c97b1

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

Changes:
  - all: https://git.openjdk.org/jdk20u/pull/71/files
  - new: https://git.openjdk.org/jdk20u/pull/71/files/0f5fa325..2157c323

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk20u&pr=71&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk20u&pr=71&range=00-01

  Stats: 233 lines in 2 files changed: 231 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk20u/pull/71.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/71/head:pull/71

PR: https://git.openjdk.org/jdk20u/pull/71