refactor: address unsafe-op-in-unsafe-fn for Windows

[weihanglo]

What does this PR try to resolve?

See #15790 (comment) and
https://triage.rust-lang.org/gha-logs/rust-lang/rust/48570988075#2025-08-21T12:21:45.8237728Z

We don't run clippy on Windows so we never catch that.

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[weihanglo]

error: test failed, to rerun pass -p cargo --test testsuite
Caused by:
process didn't exit successfully: C:\a\cargo\cargo\target\debug\deps\testsuite-5bacec5b68ca9ba2.exe (exit code: 0xc0000005, STATUS_ACCESS_VIOLATION)
note: test exited abnormally; to see the full output pass --nocapture to the harness.
C:\a_temp\f2c1a125-7845-41f4-9396-be72dd354d2a.sh: line 1: 1375 Segmentation fault cargo test -p cargo
Error: Process completed with exit code 139.