[jdk17u-dev] RFR: 8306444: Don't leak memory in PhaseChaitin::PhaseChaitin

[jyma22]

Hi all,

This pull request contains a backport of commit [b2ccc97](https://github.com/openjdk/jdk/commit/b2ccc9731e3a183bc6f31480c7d12f110633ea2b) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Johan Sjölen on Apr 24 2023 and was reviewed by Vladimir Kozlov and Roland Westrelin.

Testing: jtreg tier 1~3

Thanks!

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Commit messages:
 - Backport <b2ccc9731e3a183bc6f31480c7d12f110633ea2b>

Changes: https://git.openjdk.org/jdk17u-dev/pull/3992/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3992&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306444
  Stats: 39 lines in 1 file changed: 25 ins; 6 del; 8 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3992.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3992/head:pull/3992

PR: https://git.openjdk.org/jdk17u-dev/pull/3992