ac/llvm, radeonsi: Handle tess_rel_patch_id in common code.

We'll need to clean this up later, but for now it's better to
have it in common code than in RadeonSI.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28425>

src/amd/llvm/ac_nir_to_llvm.c

@@ -3074,9 +3074,21 @@ static bool visit_intrinsic(struct ac_nir_context *ctx, nir_intrinsic_instr *ins
       result = ac_build_gather_values(&ctx->ac, values, 3);
       break;
    }
+   case nir_intrinsic_load_tess_rel_patch_id_amd:
+      switch (ctx->stage) {
+      case MESA_SHADER_TESS_CTRL:
+         result = ac_unpack_param(&ctx->ac, ac_get_arg(&ctx->ac, ctx->args->tcs_rel_ids), 0, 8);
+         break;
+      case MESA_SHADER_TESS_EVAL:
+         result = ctx->abi->tes_rel_patch_id_replaced ? ctx->abi->tes_rel_patch_id_replaced :
+                  ac_get_arg(&ctx->ac, ctx->args->tes_rel_patch_id);
+         break;
+      default:
+         unreachable("invalid stage");
+      }
+      break;
    case nir_intrinsic_load_base_vertex:
    case nir_intrinsic_load_first_vertex:
-   case nir_intrinsic_load_tess_rel_patch_id_amd:
    case nir_intrinsic_load_ring_attr_amd:
    case nir_intrinsic_load_lds_ngg_scratch_base_amd:
    case nir_intrinsic_load_lds_ngg_gs_out_vertex_base_amd:

src/gallium/drivers/radeonsi/si_shader_llvm.c

@@ -485,9 +485,6 @@ static LLVMValueRef si_llvm_load_intrinsic(struct ac_shader_abi *abi, nir_intrin
    struct si_shader_context *ctx = si_shader_context_from_abi(abi);
 
    switch (intrin->intrinsic) {
-   case nir_intrinsic_load_tess_rel_patch_id_amd:
-      return si_get_rel_patch_id(ctx);
-
    case nir_intrinsic_load_lds_ngg_scratch_base_amd:
       return LLVMBuildPtrToInt(ctx->ac.builder, ctx->gs_ngg_scratch.value, ctx->ac.i32, "");