RFR: 8253757: Add LLVM-based backend for hsdis

[Magnus Ihse Bursie]

On Mon, 23 Nov 2020 15:55:43 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> I think a proper solution to both this and the Capstone implementation is to provide a proper framework for selecting the hsdis backend as a first step, and refactor the existing bfd implementation as the first such backend. After that, we can add llvm and capstone as alternative hsdis backend implementations.
>
> 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.

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