RFR: 8343802: Prevent NULL usage backsliding [v2]

[Kim Barrett]

On Fri, 7 Feb 2025 19:28:18 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Copy-pasting this comment from the JBS issue
>> 
>>> We have the full source available when jtreg tests are run in our internal systems. The same should be true in GHA, as well as when developers run tests locally.
>
> That doesn't imply the current approach is the best approach to access the source; it only states that the access is *possible*.

I don't see any better way.  https://openjdk.org/jtreg/vmoptions.html doesn't list anything other than
the "test.src" property as a way to find the source hierarchy.  If you know of an alternative, please suggest.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23466#discussion_r1947346451