[llvm] [Offload] Allow setting null arguments in olLaunchKernel and fix amdgpu handling for empty kernel arguments (PR #141958)

[Ross Brunton via llvm-commits]

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@@ -838,6 +838,12 @@ olLaunchKernel_val(ol_queue_handle_t Queue, ol_device_handle_t Device,
           "validation failure: Queue == NULL && EventOut != NULL");
     }
 
+    if (ArgumentsSize > 0 && ArgumentsData == NULL) {
+      return createOffloadError(
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RossBrunton wrote:

I don't think it is? It should be an error condition if a size is specified and ArgumentsData hasn't been.

https://github.com/llvm/llvm-project/pull/141958