[RyuJit/WASM] Crossgen2 integration and further factoring

[SingleAccretion]

This allows:

int add(int a, int b) => a + b;

to run until the NYI in codegen.

[adamperlin]

@SingleAccretion I am starting work on the R2R object writer. Is it alright if I copy the crossgen2 integration bits from this PR for that purpose?

[SingleAccretion]

I am starting work on the R2R object writer. Is it alright if I copy the crossgen2 integration bits from this PR for that purpose?

Sure!

(But do be prepared for them to perhaps change a bit in the course of the review.)

[adamperlin]

I am starting work on the R2R object writer. Is it alright if I copy the crossgen2 integration bits from this PR for that purpose?

Sure!

(But do be prepared for them to perhaps change a bit in the course of the review.)

Ok, that sounds good! I will be prepared that they may change and I'll check back during review!

[SingleAccretion]

@dotnet/jit-contrib

[jkotas]

I think this should be either fully decoupled from PE file arch constants, or we should define PE file constant for WASM.

[SingleAccretion]

The only reason I haven't updated the numbers is that it would require a Jit-EE GUID update. Worth it?

[jkotas]

If we are going to decouple it from PE file arches, we may want to match System.Runtime.InteropServices.Architecture.

[jkotas]

it would require a Jit-EE GUID update. Worth it?

It is fine with me. I am not a fan of accumulating cruft to be cleaned up later to save JIT-EE GUID updates.

[am11]

Jit-EE GUID update.

BTW, we don't need to switch to windows for it anymore. We can use src/coreclr/tools/Common/JitInterface/ThunkGenerator/gen.sh which syncs thunks and updates the GUID.

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