RFR: Merge jdk19

[Jesper Wilhelmsson]

Forwardport JDK 19 -> JDK 20

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Commit messages:
 - Merge
 - 8288533: Missing @param tags in com.sun.source classes
 - 8288526: ProblemList gc/stress/TestStressG1Humongous.java on windows-x64
 - 8288414: Long::compress/expand samples are not correct
 - 8288289: Preview APIs in jdk.jdi, jdk.management, and jdk.jfr should be reflective preview APIs
 - 8288324: Loom: Uninitialized JvmtiEnvs in VM_Virtual* ops
 - 8288360: CI: ciInstanceKlass::implementor() is not consistent for well-known classes
 - 8287889: (fs) Files.copy description of REPLACE_EXISTING is hard to read
 - 8288303: C1: Miscompilation due to broken Class.getModifiers intrinsic
 - 8288214: serviceability/jvmti/vthread/VThreadNotifyFramePopTest/VThreadNotifyFramePopTest.java test failed
 - ... and 1 more: https://git.openjdk.org/jdk/compare/39526e28...8b43a607

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk&pr=9179&range=00.0
 - jdk19: https://webrevs.openjdk.org/?repo=jdk&pr=9179&range=00.1

Changes: https://git.openjdk.org/jdk/pull/9179/files
  Stats: 254 lines in 17 files changed: 193 ins; 13 del; 48 mod
  Patch: https://git.openjdk.org/jdk/pull/9179.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9179/head:pull/9179

PR: https://git.openjdk.org/jdk/pull/9179