[llvm] [Offload] Add device UID (PR #164391)

[Joseph Huber via llvm-commits]

================
@@ -293,6 +294,12 @@ struct CUDADeviceTy : public GenericDeviceTy {
     if (auto Err = Plugin::check(Res, "error in cuDeviceGet: %s"))
       return Err;
 
+    CUuuid UUID = {0};
+    Res = cuDeviceGetUuid(&UUID, Device);
+    if (auto Err = Plugin::check(Res, "error in cuDeviceGetUuid: %s"))
+      return Err;
+    setDeviceUidFromVendorUid(toHex(UUID.bytes, true));
----------------
jhuber6 wrote:

What's the expected use of this? I'm leaning towards not spending the extra bytes to store this permanently and just compute it on-demand. I.e. no `setDeviceUiD` there is only `getDeviceUiD` since we assume it's constant per device (at least within the execution environment since these aren't *Universally* unique IDs.)

https://github.com/llvm/llvm-project/pull/164391