[llvm] [Offload] Debug message update part 2 (PR #171683)

[Alex Duran via llvm-commits]

================
@@ -374,7 +376,7 @@ TargetPointerResultTy MappingInfoTy::getTargetPointer(
         if (Ret != OFFLOAD_SUCCESS) {
           // If it fails to wait for the event, we need to return nullptr in
           // case of any data race.
-          REPORT("Failed to wait for event " DPxMOD ".\n", DPxPTR(Event));
+          REPORT() << "Failed to wait for event " << Event;
----------------
adurang wrote:

```suggestion
          REPORT() << "Failed to wait for event " << Event << "."; 
```

https://github.com/llvm/llvm-project/pull/171683