USM/mixed2template.cpp hanging on Win BMG

### Describe the bug

```
Test d:\github\_work\llvm\llvm\build-e2e\usm\output\mixed2template.cpp.tmp1.out hung!
```

https://github.com/intel/llvm/actions/runs/14833398810/job/41641860725?pr=18309

### To reproduce

_No response_

### Environment

_No response_

### Additional context

_No response_