nir/lower_io: Add a 32 and 64-bit global address formats

These are simple scalar addresses.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/compiler/nir/nir.h

@@ -2946,6 +2946,16 @@ bool nir_lower_io(nir_shader *shader,
                   nir_lower_io_options);
 
 typedef enum {
+   /**
+    * An address format which is a simple 32-bit global GPU address.
+    */
+   nir_address_format_32bit_global,
+
+   /**
+    * An address format which is a simple 64-bit global GPU address.
+    */
+   nir_address_format_64bit_global,
+
    /**
     * An address format which is comprised of a vec2 where the first
     * component is a vulkan descriptor index and the second is an offset.