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/test_opt_cmod_propagation.cpp

@@ -37,7 +37,7 @@ protected:
    void *ctx;
    struct brw_wm_prog_data *prog_data;
    struct gl_shader_program *shader_prog;
-   fs_visitor *v;
+   brw_shader *v;
    brw_builder bld;
 
    void test_mov_prop(enum brw_conditional_mod cmod,
@@ -67,7 +67,7 @@ cmod_propagation_test::cmod_propagation_test()
    nir_shader *shader =
       nir_shader_create(ctx, MESA_SHADER_FRAGMENT, NULL, NULL);
 
-   v = new fs_visitor(compiler, &params, NULL, &prog_data->base, shader,
+   v = new brw_shader(compiler, &params, NULL, &prog_data->base, shader,
                       8, false, false);
 
    bld = brw_builder(v).at_end();
@@ -96,7 +96,7 @@ instruction(bblock_t *block, int num)
 }
 
 static bool
-cmod_propagation(fs_visitor *v)
+cmod_propagation(brw_shader *v)
 {
    const bool print = getenv("TEST_DEBUG");