8306444: Don't leak memory in PhaseChaitin::PhaseChaitin

[jyma22]

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Hi all,

This pull request contains a backport of commit b2ccc97 from the openjdk/jdk repository.

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

Thanks!

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Progress

• [x] Change must not contain extraneous whitespace
• [ ] JDK-8306444 needs maintainer approval
• [x] Commit message must refer to an issue

Issue

• JDK-8306444: Don't leak memory in PhaseChaitin::PhaseChaitin (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/3992/head:pull/3992
$ git checkout pull/3992

Update a local copy of the PR:
$ git checkout pull/3992
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/3992/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 3992

View PR using the GUI difftool:
$ git pr show -t 3992

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/3992.diff