RFR: Merge jdk17

[Jesper Wilhelmsson]

Forwardport JDK 17 -> JDK 18

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Commit messages:
 - Merge
 - 8270872: Final nroff manpage update for JDK 17
 - 8271588: JFR Recorder Thread crashed with SIGSEGV in write_klass
 - 8271863: ProblemList serviceability/sa/TestJmapCore.java on linux-x64 with ZGC

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.java.net/?repo=jdk&pr=5026&range=00.0
 - jdk17: https://webrevs.openjdk.java.net/?repo=jdk&pr=5026&range=00.1

Changes: https://git.openjdk.java.net/jdk/pull/5026/files
  Stats: 307 lines in 32 files changed: 129 ins; 33 del; 145 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5026.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5026/head:pull/5026

PR: https://git.openjdk.java.net/jdk/pull/5026