Some SYCL tests hang on Windows

### Describe the bug

https://github.com/intel/llvm/actions/runs/29109154467/job/86423110965?pr=21598
Test d:\github\_work\llvm\llvm\build-e2e\basic\accessor\output\accessor_property_list_placeholder.cpp.tmp.out hung!
Test d:\github\_work\llvm\llvm\build-e2e\bfloat16\output\bfloat16_type.cpp.tmp.out hung!
Test d:\github\_work\llvm\llvm\build-e2e\kernelcompiler\output\opencl_local_mem.cpp.tmp.out hung!

https://github.com/intel/llvm/actions/runs/29109154385/job/86422957452?pr=21598
Test d:\github\_work\llvm\llvm\build-e2e\kernelandprogram\output\cache_env_vars_win.cpp.tmp.out hung!
Test d:\github\_work\llvm\llvm\install\bin\filecheck.exe hung!

### To reproduce

### Environment

### Additional context

_No response_

Start by inspecting the two linked GitHub Actions jobs and the listed hanging tests, including the accessor, bfloat16, kernelcompiler, kernelandprogram, and filecheck.exe paths. Reproduce the hangs on Windows and determine the relevant failure output; done means these tests and FileCheck complete without hanging in the affected jobs.

Written by the indexing model from the issue text.