[llvm] [AMDGPU] Introduce ordering parameter to atomic intrinsics and introduce new llvm.amdgcn.image.atomic.load intrinsic. (PR #73613)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Sorry for the late response.
> 
> > I'm wondering if we should encode the ordering with metadata or something better than an integer
> 
> Is visibility the only reason for this suggestion? @nhaehnle what do you think?

Partially. Previously I was thinking of introducing an IR change to allow arbitrary calls to carry this kind of information. i.e. either a control bit to add the atomicrmw operands, or to encode it as an operand bundle. Really deviating from how atomicrmw represents this is unfortunate 

https://github.com/llvm/llvm-project/pull/73613