RFR: 8316273: JDK-8315818 broke JVMCIPrintProperties on libgraal [v3]

[Doug Simon]

> This PR prevents the possibility for `JVMCIPrintProperties` to emit output more than once. That possibility was introduced by [JDK-8315818](https://bugs.openjdk.org/browse/JDK-8315818) by allowing JVMCI initialization to happen earlier on a compiler thread that races with the main thread in terms of JVMCI initialization.

Doug Simon has updated the pull request incrementally with one additional commit since the last revision:

  exit HotSpot, not just libjvmci after printing JVMCI properties

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15739/files
  - new: https://git.openjdk.org/jdk/pull/15739/files/d9b8fe3b..ebbb6636

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15739&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15739&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15739.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15739/head:pull/15739

PR: https://git.openjdk.org/jdk/pull/15739