[clang] [llvm] [AMDGPU][GFX12.5] Reimplement monitor load as an atomic operation (PR #177343)

[Pierre van Houtryve via cfe-commits]

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@@ -341,6 +348,29 @@ bool SemaAMDGPU::CheckAMDGCNBuiltinFunctionCall(unsigned BuiltinID,
   return false;
 }
 
+bool SemaAMDGPU::checkAtomicOrderingCABIArg(CallExpr *TheCall, unsigned ArgIdx,
+                                            bool MayLoad, bool MayStore) {
+  Expr *AtomicOrdArg = TheCall->getArg(ArgIdx);
+  Expr::EvalResult AtomicOrdArgRes;
+  if (!AtomicOrdArg->EvaluateAsInt(AtomicOrdArgRes, getASTContext()))
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Pierre-vh wrote:

> There should be a sema test for this (also make sure to test the case where this is coming from a template arg, we've had a few bugs on these with those)

`test_amdgcn_load_monitor_ao_constant` already checks it, I've added templated tests too

https://github.com/llvm/llvm-project/pull/177343