[llvm] [Offload] Implement the remaining initial Offload API (PR #122106)

[Joseph Huber via llvm-commits]

================
@@ -1088,26 +1089,33 @@ olEnqueueKernelLaunch_val(ol_queue_handle_t Queue, ol_kernel_handle_t Kernel,
       return OL_ERRC_INVALID_NULL_HANDLE;
     }
 
+    if (NULL == ArgumentsData) {
+      return OL_ERRC_INVALID_NULL_POINTER;
+    }
----------------
jhuber6 wrote:

```suggestion
    if (!ArgumentsData)
      return OL_ERRC_INVALID_NULL_POINTER;
```

https://github.com/llvm/llvm-project/pull/122106