https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121218

--- Comment #12 from Richard Sandiford <rsandifo at gcc dot gnu.org> ---
On the REG_DEAD thing: REG_DEAD notes are not kept up-to-date, so any pass that
wants to use them needs to ask for them to be recomputed.  The REG_DEAD usage
in scalar_chain::convert_insn_common suggests that STV should be calling
df_note_add_problem.

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