[PATCH v2 0/4] MR402: vkd3d-shader: Minor fixes to clangd warnings (clangd).

[Francisco Casas (＠fcasas)]

Some fixes to valid clangd warnings, since I am using it as linter.

Also, I am removing enum hlsl_error_level on 4/6, since it doesn't seem to be meant to be used anywhere after 3/6.

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  v2: vkd3d-shader/d3dbc: Use D3DSIO_TEXKILL instead of VKD3D_SM1_OP_TEXKILL (clangd).
      vkd3d-shader/hlsl: Remove enum hlsl_error_level (clangd).
      vkd3d-shader/tpf: Avoid translations to D3DDECLUSAGE and back (clangd).
      vkd3d-shader: Remove unnecessary fallthroughs (clangd).
 
https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/402