pan/bi: Stub out scoped_barrier

Implement like other workgroup barriers. No subgroup barriers yet, but that
doesn't seem needed yet.

Fixes test_basic.async_copy_global_to_local and a pile of other OpenCL tests.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18656>

src/panfrost/bifrost/bifrost_compile.c

@@ -1687,6 +1687,14 @@ bi_emit_intrinsic(bi_builder *b, nir_intrinsic_instr *instr)
                 bi_barrier(b);
                 break;
 
+        case nir_intrinsic_scoped_barrier:
+                assert(b->shader->stage != MESA_SHADER_FRAGMENT);
+                assert(nir_intrinsic_memory_scope(instr) > NIR_SCOPE_SUBGROUP &&
+                       "todo: subgroup barriers (different divergence rules)");
+
+                bi_barrier(b);
+                break;
+
         case nir_intrinsic_shared_atomic_add:
         case nir_intrinsic_shared_atomic_imin:
         case nir_intrinsic_shared_atomic_umin: