[crac] RFR: RFC: -XX:CPUFeatures=0xnumber for CPU migration [v5]

[Ashutosh Mehra]

On Fri, 17 Feb 2023 14:42:20 GMT, Dan Heidinga <heidinga at openjdk.org> wrote:

> One reasonable design point for generic is to match the set of features allowed when compiling the JVM so that a checkpoint is as portable as running the app with the java executable. 

I used `LOG=cmdlines make images` to see the command lines used during compilation (with `make images`). I don't see any `march` or `mtune` option in the command line. As I mentioned earlier we can use `gcc -Q --help=target` to see the extended instructions sets enabled by gcc (would need some filtering I believe). I guess we can use that set as the baseline to begin with.

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PR: https://git.openjdk.org/crac/pull/41