Arm GCC buildbot workers

[Christophe Lyon]

Hi Mark,

I'd like to start 2 more workers, for GCC: one for armhf, one for arm64.
They will be running ubuntu-22.04, 20 CPUs each.

So:
ncpus:20
maxcpus:20
max_builds:1

I'd like them to run "gcc_full", which should take ~2h according to my
experiments.

Looking at https://builder.sourceware.org/buildbot/#/workers, I suspect
there may be at least a naming problem since the other workers have
"generic names" (I mean we already have similar workers, dedicated to gdb).

BTW, I'm wondering whether it was a mistake to have our other workers
named armXX-ubuntu-YY, since the other ones are named distro-arch?

Thanks,

Christophe
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