Affine map util

[Pangoraw]

Not sure if we want to include this but this works like this:

julia> using MLIR: IR, AffineUtils

julia> IR.context!(IR.Context()) do
           AffineUtils.@map (d1, d2)[s0] -> (d1 + s0, d2 % 10)
       end
MLIR.IR.AffineMap(#= (d0, d1)[s0] -> (d0 + s0, d1 mod 10) =#)

[mofeing]

I would move all this to the IR folder and remove the AffineUtils module maybe. Or just use that module for the walk function.

[mofeing]

I would move all this to the IR folder and remove the AffineUtils module maybe. Or just use that module for the walk function.

[mofeing]

@Pangoraw I've integrated these changes into #62

[Pangoraw]

@Pangoraw I've integrated these changes into #62

Great! Thanks