63a38b945d
Remove the early call to nir_lower_sysvals_to_varyings. This guarantees
that we only call it after lower_system_values has replaced the
variables with intrinsics. It turns out that a sequence like this
doesn't work:
1. shader declares Layer builtin as a signed integer
2. nir_lower_sysvals_to_varyings turns it into a varying (but keeps the
signed integer type)
3. nir_lower_input_attachments (or some other pass) creates a
nir_load_layer_id intrinsic.
4. nir_lower_sysvals_to_varyings is called again, and when creating the
varying variable it passes an unsigned type to
nir_get_variable_with_location(), which asserts because there is
already a signed integer variable.
By making lower_sysvals_to_varyings happen late for layer, we can avoid
this happening by lowering away the variable before (2).
Fixes: 5bbbf5cf9b ("tu: Set use_layer_id_sysval for nir_lower_input_attachments")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38793>
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