x/build: use Google Cloud for aix/ppc64 and linux/ppc64x builders

[bradfitz]

Google Cloud now supports POWER:

https://cloud.google.com/blog/products/gcp/ibm-power-systems-now-available-on-google-cloud

Maybe we can start running the AIX and linux/ppc64x builders on GCP (and scale VMs dynamically as needed) instead of OSUOSL (where we have a fixed and limited capacity).

/cc @laboger @trex58 @toothrot

[laboger]

Interesting, but I doubt it supports linux/ppc64, probably only linux/ppc64le.

[jmmv]

I came to this bug from the now-locked #34850 and, after following the discussion, I just wanted to mention one thing regarding OSes and ppc64 big-endian support. While all Linux distributions seem to have dropped support for this platform, FreeBSD/powerpc64 still exists and works. It might be an option too.

[mcmilk]

FreeBSD/powerpc64 support would be nice

[bobpaul]

Along with FreeBSD/ppc64 and OpenBSD/pp64, there are still Linux distros for PPC64:

• Adelie
• ArchPower
• Gentoo
• Chimera
• And PPC64 (big endian) isn't completely dead on Debian. Oregon State still runs a build server for PPC64.