[jdk21u] RFR: 8309475: Test java/foreign/TestByteBuffer.java fails: a problem with msync (aix) [v2]

[Tyler Steele]

> Hi all,
> 
> This pull request contains a backport of commit [fdac6a6a](https://github.com/openjdk/jdk/commit/fdac6a6ac871366614efe44aca58ab520766b5c8) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository. It fixes TestByteBuffer.java, and depends on changes the backported by #77.
> 
> The commit being backported was authored by Tyler Steele on 18 Aug 2023 and was reviewed by Christoph Langer and Thomas Stuefe.
> 
> Thanks!

Tyler Steele 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 backwaterred-backport-395fc788
 - Backport 395fc78880a91eeb06a08c1abf6905d580a650c0

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

Changes:
  - all: https://git.openjdk.org/jdk21u/pull/82/files
  - new: https://git.openjdk.org/jdk21u/pull/82/files/1c027c6e..090829d3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u&pr=82&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u&pr=82&range=00-01

  Stats: 1180 lines in 42 files changed: 962 ins; 106 del; 112 mod
  Patch: https://git.openjdk.org/jdk21u/pull/82.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/82/head:pull/82

PR: https://git.openjdk.org/jdk21u/pull/82