RFR: Merge jdk19 [v2]

[Jesper Wilhelmsson]

> Forwardport JDK 19 -> JDK 20

Jesper Wilhelmsson has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 146 commits:

 - Merge
 - 8289126: Cleanup unnecessary null comparison before instanceof check in jdk.hotspot.agent
   
   Reviewed-by: ayang, cjplummer
 - 8289078: Make STARTTIME_ANY and STARTTIME_PROCESS_UNKNOWN fields static in ProcessHandleImpl
   
   Reviewed-by: jpai, rriggs, bpb, naoto, iris
 - 8289147: unify os::infinite_sleep on posix platforms
   
   Reviewed-by: mdoerr, kbarrett, dholmes
 - 8266670: Better modeling of access flags in core reflection
   
   Reviewed-by: mchung, rriggs, asotona
 - 8286395: Address possibly lossy conversions in java.security.jgss
   
   Reviewed-by: chegar
 - 8286389: Address possibly lossy conversions in jdk.crypto.ec
   
   Reviewed-by: chegar, xuelei
 - 8288130: compiler error with AP and explicit record accessor
   
   Reviewed-by: jlahoda
 - 8289166: ProblemList tools/jlink/plugins/CompressorPluginTest.java
   
   Reviewed-by: lmesnik, bpb
 - 8289098: clean up ported serviceability/jvmti tests
   
   Reviewed-by: kevinw, sspitsyn
 - ... and 136 more: https://git.openjdk.org/jdk/compare/7e13cdb7...9579cc05

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Changes: https://git.openjdk.org/jdk/pull/9296/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9296&range=01
  Stats: 47784 lines in 1125 files changed: 22921 ins; 12915 del; 11948 mod
  Patch: https://git.openjdk.org/jdk/pull/9296.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9296/head:pull/9296

PR: https://git.openjdk.org/jdk/pull/9296