treewide: Stop lowering legacy atomics

There are no more producers of legacy atomics so these calls are inert.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23036>

src/microsoft/compiler/dxil_nir.c

@@ -790,7 +790,7 @@ lower_shared_atomic(nir_builder *b, nir_intrinsic_instr *intr)
 bool
 dxil_nir_lower_atomics_to_dxil(nir_shader *nir)
 {
-   bool progress = nir_lower_legacy_atomics(nir);
+   bool progress = false;
 
    foreach_list_typed(nir_function, func, node, &nir->functions) {
       if (!func->is_entrypoint)