RFR: 8289137: Automatically adapt Young/OldPLABSize and when setting only MinTLABSize [v3]

[Thomas Schatzl]

> Hi all,
> 
>   can I get reviews for this enhancement fixing a sometimes annoying UI issue where setting `-XX:MinTLABSize` does not automatically update `-XX:YoungPLABSize` and `-XX:OldPLABSize` if they are not set?
> This avoids some unnecessary retries.
> 
> Testing: gha, test case
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  iwalulya review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9425/files
  - new: https://git.openjdk.org/jdk/pull/9425/files/7d7382bc..af272e30

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9425&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9425&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9425.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9425/head:pull/9425

PR: https://git.openjdk.org/jdk/pull/9425