aco: optimize more uniform reductions/scans

Uniform atomic optimization will create these.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6558>

src/amd/compiler/aco_builder_h.py

@@ -349,6 +349,10 @@ public:
        return def;
    }
 
+   Definition hint_${fixed}(RegClass rc) {
+       return hint_${fixed}(def(rc));
+   }
+
 % endfor
    /* hand-written helpers */
    Temp as_uniform(Op op)