[llvm] [Offload] Introduce ATTACH map-type support for pointer attachment. (PR #149036)

[Joseph Huber via llvm-commits]

================
@@ -2538,6 +2538,10 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
                                           getAgent(), (uint64_t)Size);
   }
 
+  Error dataFence(__tgt_async_info *Async) override {
----------------
jhuber6 wrote:

These are all just  stubs, why do we need these in this patch? I'm not familiar with that this is supposed to do either, I figured fencing like this came from the signals.

https://github.com/llvm/llvm-project/pull/149036