RFR: 8289778: ZGC: incorrect use of os::free() for mountpoint string handling after JDK-8289633

[Jie Fu]

On Wed, 6 Jul 2022 16:19:00 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> I'm curious, which tests did show the bug? Because I ran GHAs and a selection of our nightlies.

This bug can be exposed by `java -XX:+UseZGC` on some of our cloud machines with os/tlinux, not all the platforms would crash (e.g., I didn't reproduce it on Ubuntu20.04).

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PR: https://git.openjdk.org/jdk/pull/9387