nir: Add a bool to int32 lowering pass

We also enable it in all of the NIR drivers.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/compiler/nir/meson.build

@@ -114,6 +114,7 @@ files_libnir = files(
   'nir_lower_alpha_test.c',
   'nir_lower_atomics_to_ssbo.c',
   'nir_lower_bitmap.c',
+  'nir_lower_bool_to_int32.c',
   'nir_lower_clamp_color_outputs.c',
   'nir_lower_clip.c',
   'nir_lower_clip_cull_distance_arrays.c',