[llvm] fix build error in MSVC build (PR #86622)

[via llvm-commits]

SevenIsSeven wrote:

> Would you like help merging/commiting this? We've also started seeing this warning/error in our downstream MSVC builds.

”Only those with [write access](https://docs.github.com/articles/what-are-the-different-access-permissions) to this repository can merge pull requests.“
should I apply for write access from somewhere? or could you help me merge if you have the write access? thanks~

https://github.com/llvm/llvm-project/pull/86622