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

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

Also; for MSVC/LLVM style import libraries, one could simply just look at the member file names as well, for the individual import files (not the header/trailer - as import libraries can contain other object files as well). But as we need logic like this for GNU import libraries, we can use the same logic for both kinds (as MSVC/LLVM style import libraries have regular object files for headers/trailers).

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