[llvm] [NVPTX] Add syncscope support for cmpxchg (PR #140812)

[Akshay Deodhar via llvm-commits]

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@@ -303,6 +304,7 @@ bool AtomicExpandImpl::processAtomicInstr(Instruction *I) {
 
   if (TLI->shouldInsertFencesForAtomic(I)) {
     auto FenceOrdering = AtomicOrdering::Monotonic;
+    SyncScope::ID SSID = SyncScope::System;
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akshayrdeodhar wrote:

Removed the API- the scope of the fence will be exactly the same as the scope of the cas- so the fence APIs can infer the scope of the fence directly.

https://github.com/llvm/llvm-project/pull/140812