[llvm] Fixed build with C++20 standard (PR #169772)

[Vedran Miletić via llvm-commits]

vedranmiletic wrote:

> Please update the description of the PR with a description of the problem you are trying to fix, I had to find this comment to understand the context. Thanks [#139072 (comment)](https://github.com/llvm/llvm-project/issues/139072#issuecomment-2888894075)

Hope it is better now.

https://github.com/llvm/llvm-project/pull/169772