[jdk21u-dev] RFR: 8316661: CompilerThread leaks CodeBlob memory when dynamically stopping compiler thread in non-product

[Goetz Lindenmaier]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport edcc559f09364da3692862e1f3d0636aa8eec1d4

Changes: https://git.openjdk.org/jdk21u-dev/pull/99/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=99&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316661
  Stats: 58 lines in 6 files changed: 19 ins; 32 del; 7 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/99.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/99/head:pull/99

PR: https://git.openjdk.org/jdk21u-dev/pull/99