intel/compiler: Pass shader_stats for each SIMD mode

Passing shader_stats to the fs_generator constructor means that the
SIMD8 shader stats from the visitor (such as the scheduler mode) will be
reported out for the SIMD16/SIMD32 versions as well.

As you can see, we are now passing 'shader_stats' and 'stats' to
generate_code(), which is obviously odd looking. Ian rebased and
committed an old patch of mine which added the shader_stats struct on
July 30 in commit dabb5d4bee (i965/fs: Add a shader_stats struct.) and
shortly after on August 12 Jason added the brw_compile_stats struct in
commit 134607760a (intel/compiler: Fill a compiler statistics struct).

I'd like to combine the two, but I'm not sure how. shader_stats is an
input to generate_code() while brw_compile_stats is an output and is
only used by the Vulkan driver. Leave it as is for now...

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4093>

src/intel/compiler/brw_fs.h

@@ -467,13 +467,13 @@ public:
    fs_generator(const struct brw_compiler *compiler, void *log_data,
                 void *mem_ctx,
                 struct brw_stage_prog_data *prog_data,
-                struct shader_stats shader_stats,
                 bool runtime_check_aads_emit,
                 gl_shader_stage stage);
    ~fs_generator();
 
    void enable_debug(const char *shader_name);
    int generate_code(const cfg_t *cfg, int dispatch_width,
+                     struct shader_stats shader_stats,
                      struct brw_compile_stats *stats);
    const unsigned *get_assembly();
 
@@ -572,7 +572,6 @@ private:
    unsigned dispatch_width; /**< 8, 16 or 32 */
 
    exec_list discard_halt_patches;
-   struct shader_stats shader_stats;
    bool runtime_check_aads_emit;
    bool debug_flag;
    const char *shader_name;