[jdk17u-dev] RFR: 8282704: runtime/Thread/StopAtExit.java may leak memory

[Goetz Lindenmaier]

I backport this for parity with 17.0.8-oracle.

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Commit messages:
 - Backport 3f923b82c31325504430b50dee262fd460004e7b

Changes: https://git.openjdk.org/jdk17u-dev/pull/1278/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1278&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8282704
  Stats: 66 lines in 1 file changed: 63 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1278.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1278/head:pull/1278

PR: https://git.openjdk.org/jdk17u-dev/pull/1278