st/nir: Keep stages inputs/outputs unified after nir_shader_gather_info
'nir_shader_gather_info' call added to 'st_create_vp_variant' function in 8a0dd0af, and used for non-VS shader stages since 6864ff35, to consider added varyings, after possible lowerings applied. This overwrites 'inputs_read' after they were already unified with outputs of previous stage.
Fix this by unifying inputs/outputs of each stage once again.
Fixes: Closes:
Signed-off-by: Yevhenii Kharchenko yevhenii.kharchenko@globallogic.com
Edited by Yevhenii Kharchenko