i965: Add a brw_wm_prog_data::has_render_target_reads field.

State upload code should use prog_data rather than poking at shader_info
directly.

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>

src/intel/compiler/brw_compiler.h

@@ -614,6 +614,7 @@ struct brw_wm_prog_data {
    bool uses_src_depth;
    bool uses_src_w;
    bool uses_sample_mask;
+   bool has_render_target_reads;
    bool has_side_effects;
    bool pulls_bary;
 

src/intel/compiler/brw_fs.cpp

@@ -6544,6 +6544,8 @@ brw_compile_fs(const struct brw_compiler *compiler, void *log_data,
        shader->info.fs.uses_sample_qualifier ||
        shader->info.outputs_read);
 
+   prog_data->has_render_target_reads = shader->info.outputs_read != 0ull;
+
    prog_data->early_fragment_tests = shader->info.fs.early_fragment_tests;
    prog_data->post_depth_coverage = shader->info.fs.post_depth_coverage;
    prog_data->inner_coverage = shader->info.fs.inner_coverage;