RFR: JDK-8317919: pthread_attr_init handle return value and destroy pthread_attr_t object

[Matthias Baesken]

Seems we miss on AIX and Linux the handling of pthread_attr_init return value and sometimes in special cases destroying the related pthread_attr_t object.

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Commit messages:
 - JDK-8317919

Changes: https://git.openjdk.org/jdk/pull/16147/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16147&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317919
  Stats: 10 lines in 2 files changed: 8 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16147.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16147/head:pull/16147

PR: https://git.openjdk.org/jdk/pull/16147