Re: [PATCH v10 0/8] MR84: vkd3d-shader/spirv: Merge all shader IR fork and join phases into a single phase.

[Conor McCarthy (＠cmccarthy)]

In DXIL handling there will be many more cases analogous to those which shader_normaliser_new_instructions() serves. I think it's less hazardous to eliminate the need to repeat the `count + 1` formula every time.

The special MOV handler tracks the fork/join instance id. Theoretically fxc could use a FORKINSTID register directly as a register address, but instead it emits `mov r0, vForkInstanceId` and then uses r0 as the address.

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/84#note_24364