[llvm] [DWARFVerifier] Allow overlapping ranges for ICF-merged functions (PR #117952)

[Nico Weber via llvm-commits]

nico wrote:

This seems to break tests on macOS: http://45.33.8.238/macm1/97720/step_10.txt (looks like this uses `sed` features not supported by BSD sed, or at least by macOS's sed.)

Please take a look, and revert for now if it takes a while to fix.

https://github.com/llvm/llvm-project/pull/117952