turnip: fix emit_ibo

Based on the GL driver:
-Compute needs different opcode (this fixes a GPU hang problem)
-REG_A6XX_SP_IBO_LO/REG_A6XX_SP_CS_IBO_LO were swapped

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3104>
1 file changed