i965/fs: Add 64-bit int immediate support to dump_instructions()

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

src/intel/compiler/brw_shader.h

@@ -89,6 +89,8 @@ struct backend_reg : private brw_reg
    using brw_reg::f;
    using brw_reg::d;
    using brw_reg::ud;
+   using brw_reg::d64;
+   using brw_reg::u64;
 };
 #endif