A uniform block a shader declares and never reads is no longer declared
in its DXBC, as fxc does: on Direct3D 12 every constant buffer declared
must have a slot in the root signature, so pipeline creation failed for
any shader that declared one it had none for. Dolphin's ubershader
vertex shader with the dynamic vertex loader declares its geometry
block without reading it, and every ubershader pipeline on D3D12 failed
to build: draws that needed one were skipped.
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