asm instructions only available for cortex-a and cortex-r

[robamu]

I had a transitive dependency to cortex-ar for an auto-generator tool, and the assembler instructions were problematic.

I introduced feature-gating, similary to how it is done in cortex-m

[jonathanpallant]

Should we gate the asm inside the function, or the function itself? This PR does either, randomly.

[robamu]

I guess I can gate all the functions. For some reason, cortex-m gated the asm inside the function for the nop function..

[robamu]

the asm module is already feature gated, just did not see it. But maybe the feature gate can be made cortex-ar specific?

[jonathanpallant]

What host were you on?

[robamu]

x86_64

[jonathanpallant]

Then the module shouldn't be compiled?

[robamu]

Yes. I think that was a mistake on my side (I was able to solve the issue since then). I think this can be closed. Do you think a cortex-a/r specific feature gate would be useful? it would prevent using them on cortex-m, but cortex-m and cortex-ar assembler routines look really similar

[jonathanpallant]

I don't think we need to worry about someone using cortex-ar on cortex-m.