[llvm] [Utils] Identity map module-level debug info on first use in CloneFunction* (PR #118627)

[Artem Pianykh via llvm-commits]

artempyanykh wrote:

> ... I would like to test this commit on the swift compiler, since it makes heavy use of metadata cloning and could reveal potential issues. I'll do this asap

Thanks @felipepiovezan! Out of curiosity, is this about an open source version of swiftlang/swift and swiftlang/llvm-project?

https://github.com/llvm/llvm-project/pull/118627