[llvm] [AMDGPU] Update code sequence for CU-mode Release Fences in GFX10+ (PR #161638)

[Fabian Ritter via llvm-commits]

ritter-x2a wrote:

> > > Pierre-vh force-pushed the users/pierre-vh/fix-cumode-fence-gfx10 branch 15 times, most recently from [9989044](https://github.com/llvm/llvm-project/commit/99890448f0f3f7b6f4beb429a1fd16ea8a04c394) to [d89770d](https://github.com/llvm/llvm-project/commit/d89770d0d9b47e85e1fff2eddbf5b2278fb9b0fe)
> > 
> > 
> > Is this normal graphite behaviour? It is sending out a lot of email notifications!
> 
> I think we might be seeing this: #151135 The workaround is to land each PR in a stack individually, one after the other.

I tried cancelling the merge for @Pierre-vh in the Graphite UI to not block CI resources, but Graphite reports an error when I do that (and apparently keeps merging).

https://github.com/llvm/llvm-project/pull/161638