[llvm] [CodeGen] Port AtomicExpand to new Pass Manager (PR #71220)

[Matt Arsenault via llvm-commits]

================
@@ -380,7 +380,7 @@ void NVPTXPassConfig::addIRPasses() {
     addStraightLineScalarOptimizationPasses();
   }
 
-  addPass(createAtomicExpandPass());
----------------
arsenm wrote:

it's a separate change from this, not related 

https://github.com/llvm/llvm-project/pull/71220