[Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85638

--- Comment #8 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Another (checking) assertion triggers in fix_up_crossing_landing_pad:

        rtx_insn *insn = BB_END (e->src);
        rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);

        gcc_assert (note != NULL);
        gcc_checking_assert (INTVAL (XEXP (note, 0)) == old_lp->index);

Since 2 elements of cfun->eh->lp_array can share the same landing pad, you can
have a different REG_EH_REGION note on one of the edges.  I wonder why this
doesn't seem to happen with DWARF-2 exception handling.