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nir: Take if_uses into account when repairing SSA

Caio Oliveira requested to merge cmarcelo/mesa:r/nir-repair-ssa-in-if-uses into master

If a def is used as an condition before its definition, we should also consider this a case to repair. When repairing, make sure we rewrite any if conditions too.

Found in while inspecting a SPIR-V conversion from a 'continue block' that contains a conditional branch. We pull the continue block up to the beggining of the loop, and the condition in the branch ends up defined afterwards.

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