Bound-check dynamically indexed shader input registers #4603
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Halo MCC reads undefined PS inputs otherwise.
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Halo MCC is broken and reads PS inputs outside the declared range, which causes flickering on Nvidia, see ValveSoftware/Proton#2907 (comment).
Needs extensive testing in games that are known to use geometry and tessellation shaders, since handling shader i/o is finicky enough as-is.