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nir/lower_double_ops: relax lower mod()

Juan A. Suárez requested to merge jasuarez/mesa:review/relax-mod-restriction into master

Currently when lowering mod() we add an extra instruction so if mod(a,b) == b then 0 is returned instead of b, as mathematically mod(a,b) is in the interval [0, b).

But Vulkan spec has relaxed this restriction, and allows the result to be in the interval [0, b].

This commit takes this in account to remove the extra instruction required to return 0 instead.

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