https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80548

--- Comment #6 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #4)
> Created attachment 51908 [details]
> untested patch
> 
> Like this.  It fixes the problem at least for -O2.

Richi responded that the current BB copier won't handle this:
https://gcc.gnu.org/pipermail/gcc-patches/2021-December/585884.html

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