[llvm] [llvm-dwp] Give more information when incompatible version found (PR #168511)

[David Blaikie via llvm-commits]

https://github.com/dwblaikie approved this pull request.

Could further improve this by printing the dwo name of a dwo with the other version (either the first, or the most recently parsed, guess it doesn't really matter) to at least give a specific example. (this can be non-obvious if the user is building a dwp from an executable (if the user's passing dwo files on the command line, that's a bit more obvious, any previous dwo on the command line would be an example))

https://github.com/llvm/llvm-project/pull/168511