intrinsic-test: make build_{c, rust}_file generic

[folkertdev]

Most of the tricky logic of SupportedArchitectureTest is now in the trait, making it a lot easier, and shorter, to define new variants. That should make the x86 work a lot simpler.

best reviewed commit-by-commit I think.

cc @madhav-madhusoodanan

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[sayantn]

LGTM, cc @madhav-madhusoodanan waiting for your confirmation as you have been working on intrinsic-test

[madhav-madhusoodanan]

Really useful commits @folkertdev, particularly moving print_results_c and removing the IntrinsicDefinition trait, and placing the arch-specific constants back in configs so that they don't have to be moved around.

Looks good to me too.