[llvm] Make sure all matrix options are run in libc premerge testing (PR #146162)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> is there any context for putting the linux (and maybe windows) runs on the google machines vs the github ones? (I also don't have context about the github enterprise move and what that means for buildbots)

Github ones should probably be fine. We probably need to do some capacity planning on the Google provided machines if we want to run these tests there. I'm not sure what the status of the Github enterprise move is, but once that is done, this will not cause any problems and probably won't cause any currently. If it does, we can revisit.

https://github.com/llvm/llvm-project/pull/146162