[jdk22u] RFR: 8326446: The User and System of jdk.CPULoad on Apple M1 are inaccurate [v2]

[Long Yang]

> Hi all
> 
> Could I have a review of this backport.
> 
> This pull request contains a backport of commit [8dbd4b391f7deb1a46a5f07f0bc46f23d6715ddb](https://github.com/openjdk/jdk/commit/8dbd4b391f7deb1a46a5f07f0bc46f23d6715ddb) from the [openjdk/jdk](https://github.com/openjdk/jdk) repository.
> 
> This backport is clean.
> 
> Testing: I ran test/jdk/jdk/jfr/event/os/TestCPULoad.java and passed.

Long Yang has updated the pull request incrementally with one additional commit since the last revision:

  add blank line to make this backport clean

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

Changes:
  - all: https://git.openjdk.org/jdk22u/pull/161/files
  - new: https://git.openjdk.org/jdk22u/pull/161/files/87090b2e..e988afcf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk22u&pr=161&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk22u&pr=161&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk22u/pull/161.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/161/head:pull/161

PR: https://git.openjdk.org/jdk22u/pull/161