Add visibility for gloop/base in BUILD.bazel

absl/debugging/BUILD.bazel

diff --git a/absl/debugging/BUILD.bazel b/absl/debugging/BUILD.bazel
index 3dd8ba6..556ab9c 100644
--- a/absl/debugging/BUILD.bazel
+++ b/absl/debugging/BUILD.bazel
@@ -245,6 +245,7 @@
     visibility = [
         "//absl/container:__pkg__",
         "//absl/debugging:__pkg__",
+        "@do_not_use_for_gloop_visibility_only//gloop/base:__pkg__",
     ],
     deps = [
         ":demangle_rust",