AMDGPU: Make v2f32 -> v2f16 legal when target supports v_cvt_pk_f16_f32 (#139956) If targets support v_cvt_pk_f16_f32 instruction, v2f32 -> v2f16 should be legal. However, SelectionDAG does not allow us to specify the source type in the legalization rules. To workaround this, we make FP_ROUND Custom for v2f16 then set up v2f32 -> v2f16 to be legal during custom lowering. Fixes: SWDEV-532608 -- expected v_cvt_pk_f16_f32 was not generated.
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