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lima/gpir: add better lowering for ftrunc

Vasily Khoruzhick requested to merge anarsoul/mesa:lima-gpir-better-ftrunc-lowering into master

GP doesn't support ftrunc natively and unfortunately one in generic opt_algebraic is not GP-friendly either. Introduce our own lowering that utilizes fsign() that GP supports: ftrunc(a) = fmul(fsign(a), ffloor(fmax(a, -a)))

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