[PATCH v2 0/4] MR656: vkd3d-shader/ir: Introduce a better CFG structurizer, part 1.

[Giovanni Mascellani (＠giomasce)]

This first MR create an internal structured representation of the CFG and computes the domination relationship. Over a few other MRs I will implement an algorithm inspired to [this article](https://medium.com/leaningtech/solving-the-structured-control-flow-problem-o...) to compute a better structure than the one we already have, but for the moment the computed data is immediately wasted.

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  v2: vkd3d-shader/ir: Dump the domination relationship.
      vkd3d-shader/ir: Compute the domination relationship.
 
https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/656