RFR: JDK-8327444: simplify RESTARTABLE macro usage in JDK codebase

[Matthias Baesken]

We define the RESTARTABLE macro again and again at a lot of places in the JDK native codebase. This could be centralized to avoid repeating it again and again !

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Commit messages:
 - JDK-8327444

Changes: https://git.openjdk.org/jdk/pull/18132/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18132&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327444
  Stats: 113 lines in 16 files changed: 8 ins; 105 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18132.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18132/head:pull/18132

PR: https://git.openjdk.org/jdk/pull/18132