RFR: JDK-8327444: simplify RESTARTABLE macro usage in JDK codebase [v3]

[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 !

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

  Introduce windows jni_util_md.h

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18132/files
  - new: https://git.openjdk.org/jdk/pull/18132/files/f30a189d..2930075d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18132&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18132&range=01-02

  Stats: 24 lines in 19 files changed: 1 ins; 22 del; 1 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