[PATCH vkd3d v3 5/6] vkd3d-shader: Allocate constant registers for anonymous constants.

[Matteo Bruni]

Signed-off-by: Matteo Bruni <mbruni at codeweavers.com>
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An obvious future optimization would be to deduplicate constants,
e.g. mapping all the "uint 0" constants to the same register +
component.