tadarida vs REL_12_STABLE

Hi,

> On 2020-Apr-13, I wrote to buildfarm-admins:
> > As skate and snapper are increasingly difficult to keep alive and 
> > building on debian sparc, and as there aren't many sparc animals 
> > in general, I've set up four new debian sparc64 animals, two on 
> > stretch and two on buster.
> > 
> > All four animals are already successfully building all current 
> > branches, just not submitting results yet.

It turns out I'd missed one failure:

https://buildfarm.postgresql.org/cgi-bin/show_history.pl?nm=tadarida&br=REL_12_STABLE

Only tadarida fails the sequence regression test, and only 
for REL_12_STABLE. It fails with -O2 and -O1 but succeeds with -O0.

Other than that, all branches for all four animals succeed:

> mussurana | Debian | 9 Stretch | gcc | 6 | with cassert
> tadarida | Debian | 9 Stretch | gcc | 6 | without cassert
> ibisbill | Debian | 10 Buster | gcc | 8 | with cassert
> kittiwake | Debian | 10 Buster | gcc | 8 | without cassert

Both mussurana and tadarida are Stretch 9.12 with gcc 6.3.0-18+deb9u1.
There is no newer gcc source pkg for stretch or for stretch-backports.

Should I keep the -O0 flag for REL_12_STABLE for tadarida?

Thanks,
Tom