[jdk17u-dev] RFR: 8339725: Concurrent GC crashed due to GetMethodDeclaringClass

[Francesco Andreuzzi]

Backport JDK-8339725. Applies almost cleanly. Fixes a crash in concurrent GC due to GetMethodDeclaringClass.

I ran the reproducer against jdk17, and I confirm that the crash applies to this version too.

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Commit messages:
 - Backport c91fa278fe17ab204beef0fcef1ada6dd0bc37bb

Changes: https://git.openjdk.org/jdk17u-dev/pull/3646/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3646&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339725
  Stats: 244 lines in 5 files changed: 241 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3646.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3646/head:pull/3646

PR: https://git.openjdk.org/jdk17u-dev/pull/3646