intel/brw: Rename fs_visitor to brw_shader

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32536>

src/intel/compiler/brw_analysis_performance.cpp

@@ -1003,7 +1003,7 @@ namespace {
     * Estimate the performance of the specified shader.
     */
    void
-   calculate_performance(brw_performance &p, const fs_visitor *s,
+   calculate_performance(brw_performance &p, const brw_shader *s,
                          unsigned dispatch_width)
    {
       /* XXX - Note that the previous version of this code used worst-case
@@ -1069,7 +1069,7 @@ namespace {
    }
 }
 
-brw_performance::brw_performance(const fs_visitor *v) :
+brw_performance::brw_performance(const brw_shader *v) :
    block_latency(new unsigned[v->cfg->num_blocks])
 {
    calculate_performance(*this, v, v->dispatch_width);