[PATCH 4/6] Rewrite registry.h

[Tom Tromey]

Tom> This particular failure comes because the order of destruction of the
Tom> per-bfd and per-objfile objects changed.  I think it's better to avoid
Tom> this problem entirely.  I've got a patch to do this that I will send
Tom> soon.

Tom> After that's in, I'll rebase the registry series and test it with ASAN.

This series helped but there are still a couple of issues.

One I haven't investigated and I suspect it's pre-existing.  I'll look
soon.

The other I think will benefit from:

    https://sourceware.org/pipermail/gdb-patches/2022-June/189818.html

So I will at least wait for that to go in.

Tom