RFR: 8253757: Add LLVM-based backend for hsdis

[Ludovic Henry]

On Mon, 21 Dec 2020 16:03:31 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> FWIW, I started working on a framework which would add support for selectable backends for hsdis. Unfortunately it was not as simple as I initially thought, so I had to put it on hold while directing my time to working on the winenv patch instead.
>> 
>> I believe the proper way forward is to get the "selectable hsdis backend" framework in place, and then retrofit this patch to add LLVM support in that framework. If this means that this PR should be closed, or kept open until this is done, I don't know.
>
> Nag nag bot...
> 
> I'm away for the holidays now, but I intend to pick up the work on the selectable hsdis backend when I return. So while this exact code is unlikely to be the one merged, it's good to have it open to allow me to double check the solutions picked here.

@magicus that PR fell off my plate, but I'm happy to pick it up based on your "selectable hsdis backend" change.

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PR: https://git.openjdk.java.net/jdk/pull/392