RFR: 8352042: [leyden] Parallel precompilation

[John R Rose]

On Fri, 14 Mar 2025 12:22:00 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> For simplicity reasons, our current precompilation code uses effectively single-threaded blocking compiles. Even for simple cases, this makes assembly phase remarkably long. This does not scale well. We need to do precompilations in parallel. 
> 
> Unfortunately, I haven't found a good way to check that all async compilations are completed, so I introduced a new one.
> 
> Additional testing:
>  - [x] Ad-hoc precompilation tests
>  - [x] Linux x86_64 server fastdebug, `runtime/cds`

Really nice, thanks.  What motivated the type change on `CompileTaskAlloc_lock`?  Some kind of end-of-time effect that broke the mutex grab?

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PR Comment: https://git.openjdk.org/leyden/pull/49#issuecomment-2725683821