AMDGPU: Change ABI of 16-bit scalar values for gfx6/gfx7 (#175795) Keep bf16/f16 values encoded as the low half of a 32-bit register, instead of promoting to float. This avoids unwanted FP effects from the fpext/fptrunc which should not be implied by just passing an argument. This also fixes ABI divergence between SelectionDAG and GlobalISel. I've wanted to make this change for ages, and failed the last few times. The main complication was the hack to return shader integer types in SGPRs, which now needs to inspect the underlying IR type.
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