[llvm] [DevPolicy] Add guidance to not submit code or reviews on someone else's (PR #69701)

[Aaron Ballman via llvm-commits]

AaronBallman wrote:

Thank you for working on adding some clarity here! I somewhat share the concern from @efriedma-quic about this being hard to understand without some more background context.

Another thing we may want to clarify in this space is (from the RFC thread): `Banning an individual means that the individual has lost access to all project infrastructure and cannot attend LLVM events (in-person or virtual).`

That's a broader action than I had realized; for example, this means a banned individual is prohibited from filing issues. But "lost access to all project infrastructure" also sounds like "not allowed to clone the repo" or "not allowed to visit llvm.org" (because those involve accessing project infrastructure). I'm guessing we might want more nuance than that, but whatever we decide the rules are, we should clearly document them so banned individuals and the community understands what is and isn't acceptable.

https://github.com/llvm/llvm-project/pull/69701