[jdk17u-dev] RFR: 8289257: Some custom loader tests failed due to symbol refcount not decremented

[Goetz Lindenmaier]

I backport this for parity with 17.0.6-oracle.

Dropped change to problem list. Tests were not problem listed in 17. Will mark as clean.

-------------

Commit messages:
 - Backport c43bdf716596053ebe473c3b3bd5cf89482b9b01
 - Backport e322e77e9535fc3f37b409a1c805e9f6b728377a

Changes: https://git.openjdk.org/jdk17u-dev/pull/756/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=756&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289257
  Stats: 12 lines in 1 file changed: 0 ins; 11 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/756.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/756/head:pull/756

PR: https://git.openjdk.org/jdk17u-dev/pull/756