RFR: 8311946: add support for libgraal specific jtreg tests [v3]

[Doug Simon]

On Thu, 13 Jul 2023 20:59:10 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> "vm.libgraal.enabled" is VM's property because it enables VM's Graal JIT version which uses code in libgraal.
>
> On other hand, it is not really big matter. I am fine with "vm. hasLibgraal" since it is used only by VM.

You've convinced me - I'll rename it to `jdk.hasLibgraal`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14851#discussion_r1263072718