RFR: JDK-8317919: pthread_attr_init handle return value and destroy pthread_attr_t object [v2]

[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.

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

  add pthread_attr_destroy to SplashCreateThread

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16147/files
  - new: https://git.openjdk.org/jdk/pull/16147/files/2861da45..362851a0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16147&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16147&range=00-01

  Stats: 6 lines in 2 files changed: 4 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