[llvm] [docs][GitHub] Document alternative approach to stacked PRs (PR #132424)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> I’ve refactored this to align with your feedback. The current version outlines three different ways of handling stacked PRs, with the goal of documenting the approaches currently in use.

Thanks for the update. I think you've captured the current state of how things work reasonably well.

> Before recommending one method over the others, I’d like to give each some visibility and see if clear preferences emerge. If so, I’m happy to reflect that in the docs — possibly in a follow-up PR.

Seems reasonable enough to me. I think of what is in these docs as more of recommendations rather than just documentation so I don't think it would be bad if we could clarify here what is preferred, but if people are already using all three techniques and reviewers are generally happy, it should be fine to leave it for a follow up.

https://github.com/llvm/llvm-project/pull/132424