[llvm] [llvm-dwp] Add a new flag `--exec-dwo-path-remapping-file=<filename>`. (PR #157587)

[David Blaikie via llvm-commits]

dwblaikie wrote:

Having to read a file seems a bit unfortunate - could we do something that matches existing debug info features like `-fdebug-prefix-map`?

https://github.com/llvm/llvm-project/pull/157587