buffer/flat/global/scratch_load_{ubyte,sbyte,short}_d16(_hi),
buffer/flat/global/scratch_store_{byte,short}_d16_hi and
ds_read_{u8,i8}_d16(_hi), ds_write_b8_d16_hi threw in the decoder. They use
the same 16-bit destination/source select as the existing ds_read_u16_d16
and ds_write_b16_d16_hi: a load writes one half and keeps the other, a
_d16_hi store takes its data from the high half.
Co-Authored-By: Claude <noreply@anthropic.com>
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