nir: Switch the arguments to nir_foreach_function

This matches the "foreach x in container" pattern found in many other
programming languages.  Generated by the following regular expression:

s/nir_foreach_function(\([^,]*\),\s*\([^,]*\))/nir_foreach_function(\2, \1)/

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/compiler/nir/nir_lower_gs_intrinsics.c

@@ -198,7 +198,7 @@ nir_lower_gs_intrinsics(nir_shader *shader)
    exec_list_push_tail(&shader->globals, &var->node);
    state.vertex_count_var = var;
 
-   nir_foreach_function(shader, function) {
+   nir_foreach_function(function, shader) {
       if (function->impl) {
          nir_builder b;
          nir_builder_init(&b, function->impl);