Stage ABI-scoped unit generations

scripts/test_wasm_source_locations.sh

@@ -22,7 +22,7 @@ cleanup() {
 trap cleanup EXIT
 mkdir -p "$source_dir"
 absolute_source_dir=$(realpath "$source_dir")
-artifact_dir="$bin_directory$absolute_source_dir"
+artifact_dir="$(scripts/unit_cache_directory "$bin_directory")$absolute_source_dir"
 printf '%s\n' 'CLI(Request& context) { __builtin_trap(); }' >"$source_dir/entry.uce"
 
 set +e