[jdk17u-dev] RFR: Merge jdk17u:master

[Goetz Lindenmaier]

Merge build tag 17.0.6+9 from jdk17u to jdk17u-dev

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Commit messages:
 - Merge
 - 8293010: JDI ObjectReference/referringObjects/referringObjects001 fails: assert(env->is_enabled(JVMTI_EVENT_OBJECT_FREE)) failed: checking
 - 8280890: Cannot use '-Djava.system.class.loader' with class loader in signed JAR

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/jdk17u-dev/pull/991/files
  Stats: 189 lines in 5 files changed: 144 ins; 28 del; 17 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/991.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/991/head:pull/991

PR: https://git.openjdk.org/jdk17u-dev/pull/991