Conversion to Verona MLIR dialect about verona HOT 4 CLOSED

Stub dialect inside the Verona tree with LIT test working at https://github.com/rengolin/verona/tree/mlir-ast.

So far, it reads opaque MLIR and spits out broken MLIR, but it's just a stub for the infrastructure, not the actual code logic.

The AST -> MLIR bridge will be built once we have the parser in-tree (#111), and it's also when we'll be able to start working on the dialect proper (#106).

from verona.

Putting this on hold until we have an actual AST->MLIR conversion (#117)

from verona.

Ok, now it's time to start lowering into the Verona dialect. The first task is #203.

from verona.

We're moving the high level IR to a different design, only having the low-level parts in MLIR, so all of the designs in this issue are being deprecated in favour of a more modular approach.

from verona.