RFR: 8361198: [AIX] fix misleading error output in thread_cpu_time_unchecked [v2]

[Matthias Baesken]

> Currently we have on AIX in thread_cpu_time_unchecked misleading error output in case of failing getthrds64 . This should be adjusted .

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  pthread_getthrds_np failures - output errno too

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26070/files
  - new: https://git.openjdk.org/jdk/pull/26070/files/a190f427..b4373c42

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26070&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26070&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26070.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26070/head:pull/26070

PR: https://git.openjdk.org/jdk/pull/26070