[llvm] [Offload] Make olLaunchKernel test thread safe (PR #149497)

[Ross Brunton via llvm-commits]

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@@ -75,6 +76,11 @@ struct __tgt_async_info {
   /// should be freed after finalization.
   llvm::SmallVector<void *, 2> AssociatedAllocations;
 
+  /// Mutex to guard access to AssociatedAllocations and the Queue.
+  /// This is only used for liboffload and should be ignored in libomptarget
+  /// code.
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RossBrunton wrote:

Looks like it isn't. I must have been thinking of the older mutex.

https://github.com/llvm/llvm-project/pull/149497