[llvm] [llvm-dlltool] Implement the --identify option (PR #127465)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

> I think you forgot to commit the test, there are only `Inputs/` files in the commit.

Oops, sorry about that - fixed now!

https://github.com/llvm/llvm-project/pull/127465