nir_ allow nir_lower_clip_halfz to run in tess eval shader

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6027>

src/compiler/nir/nir_lower_clip_halfz.c

@@ -57,7 +57,8 @@ void
 nir_lower_clip_halfz(nir_shader *shader)
 {
    if (shader->info.stage != MESA_SHADER_VERTEX &&
-       shader->info.stage != MESA_SHADER_GEOMETRY)
+       shader->info.stage != MESA_SHADER_GEOMETRY &&
+       shader->info.stage != MESA_SHADER_TESS_EVAL)
       return;
 
    nir_foreach_function(function, shader) {