[llvm] [llvm] Prefer StringRef::substr(0, N) to slice(0, N) (NFC) (PR #113793)

[via llvm-commits]

https://github.com/cor3ntin requested changes to this pull request.

Please wait for feedback on https://discourse.llvm.org/t/migrating-llvm-stringref-to-std-string-view/82785/2

https://github.com/llvm/llvm-project/pull/113793