RFR: 8339475: Check return value of pthread_create in jdk coding

[Matthias Baesken]

It has been discussed that checking the return value of pthread_create should be done.
See the discussion here https://github.com/openjdk/jdk/pull/20812 about the splashscreen coding .

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Commit messages:
 - JDK-8339475

Changes: https://git.openjdk.org/jdk/pull/21182/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21182&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339475
  Stats: 7 lines in 2 files changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21182.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21182/head:pull/21182

PR: https://git.openjdk.org/jdk/pull/21182