RFR: 8328705: GHA: Cross-compilation jobs do not require build JDK

[Erik Joelsson]

On Thu, 21 Mar 2024 16:57:40 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Noticed this while fixing other GHA issues.
> 
> We pass build JDK to cross-compilation jobs, which makes them dependent on Linux-x64 builds. But we only build hotspot in all those jobs, so AFAICS there is no need for build JDK, and therefore no need for the dependency. Untying cross-compilation jobs from Linux-x64 builds make GHA more parallel. 
> 
> Additional testing:
>  - [ ] GHA

I'm not familiar enough with workflow code to fully understand the changes, but on a conceptual level I agree with this, and I could verify that the cross compile tasks in this PR didn't end up building a build jdk.

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Marked as reviewed by erikj (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18437#pullrequestreview-1953041436