[jdk17u-dev] RFR: 8284620: CodeBuffer may leak _overflow_arena

[Zhengyu Gu]

I would like to backport this patch to 17u for fixing a memory leak.

The original patch does not apply cleanly, mainly due to context difference introduced by JDK-8264207 and JDK-8054292. However, the patch is small, easily resolved manually.

Test:
- [x] hotspot_compiler

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Commit messages:
 - Backport 4d45c3ebc493bb2c85dab84b97840c8ba093ab1f

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/380/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=380&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284620
  Stats: 7 lines in 1 file changed: 3 ins; 3 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/380.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/380/head:pull/380

PR: https://git.openjdk.java.net/jdk17u-dev/pull/380