[clang] [clang-tools-extra] [llvm] [llvm][support] Move `make_absolute` from `sys::fs` to `sys::path` (PR #161459)

[Ben Langmuir via llvm-commits]

benlangmuir wrote:

> A simple git grep shows more usage in flang/lld/mlir/lldb

Do you have an example? I only see the one-argument make_absolute, which is still in `fs::` because it implicitly uses the current working directory.

https://github.com/llvm/llvm-project/pull/161459