[llvm] [NFC][AMDGPU][Doc] Add developer guideline (PR #194425)

[Sameer Sahasrabuddhe via llvm-commits]

ssahasra wrote:

> > None of this is AMDGPU specific?
> 
> I'd say some of these are more about preference and aren't really followed across the entire LLVM codebase, but are specific to AMDGPU. It's more practical to enforce them within one target first, and then try to bring them to a broader audience.

I feel the opposite way. Maybe push this through a global RFC, and then anything that does not stick can be a local AMDGPU preference?

https://github.com/llvm/llvm-project/pull/194425