radv/rt: Discard metadata after lowering intersection shaders

We inserted some enstructions and control flow. Therefore, metadata is
not valid anymore.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19866>

src/amd/vulkan/radv_rt_shader.c

@@ -998,6 +998,8 @@ nir_lower_intersection_shader(nir_shader *intersection, nir_shader *any_hit)
       }
    }
 
+   nir_metadata_preserve(impl, nir_metadata_none);
+
    /* We did some inlining; have to re-index SSA defs */
    nir_index_ssa_defs(impl);