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lima: ppir: don't lower {b,f}csel to scalar if condition is scalar

Vasily Khoruzhick requested to merge anarsoul/mesa:lima-pp-vectorize-some-sel-ops into master

Utgard PP has vector fcsel operation, but its condition is scalar.

This MR adds instruction filtering callback to nir_lower_alu_to_scalar pass to add more flexibility in filtering instructions that have to be lowered and utilizes this callback to filter out {b,f}csels that don't have to be lowered to scalar.

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