st/nir: Optionally unify inputs_read/outputs_written when linking.
i965 and iris use inputs_read/outputs_written for a shader stage to
determine the layout of input and output storage. Adjacent stages must
agree on the layout, so adjacent input/output bitfields must match.
This patch adds a new nir_shader_compiler_options::unify_interfaces
flag which asks the linker to unify the input/output interfaces between
adjacent stages.
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3249>
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