v3d/compiler: remove num_samplers_used from shader key

This is only ever used by assertions.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34742>

src/broadcom/compiler/v3d_compiler.h

@@ -412,7 +412,6 @@ struct v3d_key {
                 uint8_t return_size;
         } sampler[V3D_MAX_TEXTURE_SAMPLERS];
 
-        uint8_t num_samplers_used;
         uint8_t ucp_enables;
         bool is_last_geometry_stage;
         bool robust_uniform_access;

src/broadcom/compiler/v3d_tex.c

@@ -238,7 +238,6 @@ v3d_vir_emit_tex(struct v3d_compile *c, nir_tex_instr *instr)
          * itself, we still need to add the sampler configuration
          * parameter if the output is 32 bit
          */
-        assert(sampler_idx < c->key->num_samplers_used);
         bool output_type_32_bit =
                 c->key->sampler[sampler_idx].return_size == 32;
 

src/broadcom/compiler/vir.c

@@ -601,7 +601,6 @@ lower_tex_packing_cb(const nir_tex_instr *tex, const void *data)
    int sampler_index = nir_tex_instr_need_sampler(tex) ?
       tex->sampler_index : tex->backend_flags;
 
-   assert(sampler_index < c->key->num_samplers_used);
    return c->key->sampler[sampler_index].return_size == 16 ?
       nir_lower_tex_packing_16 : nir_lower_tex_packing_none;
 }