[llvm] [OpenMP][Offload] Update the Logic for Configuring Auto Zero-Copy (PR #143638)

[via llvm-commits]

================
@@ -286,16 +286,16 @@ void PluginManager::registerLib(__tgt_bin_desc *Desc) {
   }
   PM->RTLsMtx.unlock();
 
-  bool UseAutoZeroCopy = Plugins.size() > 0;
+  bool UseAutoZeroCopy = false;
 
   auto ExclusiveDevicesAccessor = getExclusiveDevicesAccessor();
-  for (const auto &Device : *ExclusiveDevicesAccessor)
-    UseAutoZeroCopy &= Device->useAutoZeroCopy();
+  // APUs are homogeneous set of GPUs. Check the first device for
+  // configuring Auto Zero-Copy.
+  if (ExclusiveDevicesAccessor->size() > 0) {
+    auto &Device = *(*ExclusiveDevicesAccessor)[0];
+    UseAutoZeroCopy = Device.useAutoZeroCopy();
----------------
Kewen12 wrote:

That's what mentioned in Carlo's reply. We'd be happy to revisit in the future if needed. Also, this change would work better for our future changes on device initialization. 

https://github.com/llvm/llvm-project/pull/143638