[AMDGPU] Align GlobalISel with SelectionDAG for f16 to i1/i8 saturated conversions (#188019) GlobaISel now also saturates `i1` and `i8` to `f16` conversion at `i16` where available. As a side effect, this also causes the two uniform test cases: `f16_i1` and `f16_i8` to use VALU instructions, instead of SALU instructions. This is potentially sub-optimal but it makes it consistent with ISel and has been already highlighted as future work in #187711.
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