[PATCH v4 0/5] MR749: vkd3d-shader/ir: Minimise temp usage.

[Conor McCarthy (＠cmccarthy)]

Overall this is simpler, results in less verbose SPIR-V code which is easier to debug, and eliminates stuttering issues in Horizon Zero Dawn when run in an SM 6 dev branch with Gio's cfg4 structuriser branch.

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  v4: vkd3d-shader/ir: Materialise SSAs to temps before lowering switch instructions.
      vkd3d-shader/ir: Convert SSAs to temps only if the block of origin does not dominate all uses.
 
https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/749