RFR: Merge jdk17

[Jesper Wilhelmsson]

Forwardport JDK 17 -> JDK 18

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Commit messages:
 - Merge
 - 8271403: mark hotspot runtime/memory tests which ignore external VM flags
 - 8271402: mark hotspot runtime/os tests which ignore external VM flags
 - 8271412: ProblemList javax/sound/midi/Sequencer/Looping.java
 - 8271251: JavaThread::java_suspend() fails with "fatal error: Illegal threadstate encountered: 6"
 - 8271174: runtime/ClassFile/UnsupportedClassFileVersion.java can be run in driver mode
 - 8271352: Extend jcc erratum mitigation to additional processors
 - 8270908: TestParallelRefProc fails on single core machines

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.java.net/?repo=jdk&pr=4925&range=00.0
 - jdk17: https://webrevs.openjdk.java.net/?repo=jdk&pr=4925&range=00.1

Changes: https://git.openjdk.java.net/jdk/pull/4925/files
  Stats: 43 lines in 10 files changed: 28 ins; 7 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4925.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4925/head:pull/4925

PR: https://git.openjdk.java.net/jdk/pull/4925