[llvm] Increase git fetch depth (PR #70946)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

The action does something similar internally (I believe). I think if we want something that works but is inefficient, just fetching the whole repository would work. That significantly increases the time the action takes to run (makes it ~30 minutes from my experience with the documentation action), but it should always work.

I still think https://github.com/llvm/llvm-project/pull/69766 is the ideal solution. It works and is fast from all my testing, there's just something that breaks when it actually gets deployed. I just haven't had the time to reproduce the issue on my fork and fix it.

https://github.com/llvm/llvm-project/pull/70946