[clang] [CIR] Upstream AtomicFenceOp and signal/thread fence builtins (PR #168346)

[Bruno Cardoso Lopes via cfe-commits]

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@@ -5122,6 +5122,41 @@ def CIR_AtomicClearOp : CIR_Op<"atomic.clear"> {
   }];
 }
 
+def CIR_SyncScopeKind : CIR_I32EnumAttr<"SyncScopeKind", "sync scope kind", [
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bcardosolopes wrote:

Move this attribute closer to `CIR_AtomicFetchKind`

https://github.com/llvm/llvm-project/pull/168346