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r600: Handle negate of second operator in TGSI_OPCODE_UADD

Gert Wollny requested to merge gerddie/mesa:r600-handle-tgsi-uadd-and-neg-modifier into master

nir_to_tgsi lowers nir_op_isub to UADD and the negate source mod on the second operator. Since r600 doesn't support source mods for integers but support SUB_INT we switch the opcode and clear the negate flag.

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