nir: Teach nir_divergence_analysis about Intel-specific intrinsics

- load_reloc_const is just an immediate constant load, it's convergent.

- nir_intrinsic_load_global_const_block_intel should be convergent,
  it says the address must be uniform, and we uniformize the predicate

- Lowered image intrinsics: image_deref_load_param_intel just reads
  information about an image, as long as the image variable is
  convergent it should be too.  load_raw_intel...if the address we
  come up with is convergent, it ought to be as well.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15484>

src/compiler/nir/nir_divergence_analysis.c

@@ -161,6 +161,8 @@ visit_intrinsic(nir_shader *shader, nir_intrinsic_instr *instr)
    case nir_intrinsic_load_tess_level_outer_default:
    case nir_intrinsic_load_scalar_arg_amd:
    case nir_intrinsic_load_smem_amd:
+   case nir_intrinsic_load_global_const_block_intel:
+   case nir_intrinsic_load_reloc_const_intel:
       is_divergent = false;
       break;
 
@@ -354,6 +356,8 @@ visit_intrinsic(nir_shader *shader, nir_intrinsic_instr *instr)
    case nir_intrinsic_sparse_residency_code_and:
    case nir_intrinsic_load_sbt_amd:
    case nir_intrinsic_bvh64_intersect_ray_amd:
+   case nir_intrinsic_image_deref_load_param_intel:
+   case nir_intrinsic_image_load_raw_intel:
    case nir_intrinsic_get_ubo_size:
    case nir_intrinsic_load_ssbo_address: {
       unsigned num_srcs = nir_intrinsic_infos[instr->intrinsic].num_srcs;