[clang] [lld] [lld-macho][draft]Allow folding entries with identical FDE (PR #216895)

[Ellis Hoag via cfe-commits]

ellishg wrote:

> I think this might suffer from the same bug I described in [#213778 (comment)](https://github.com/llvm/llvm-project/pull/213778#discussion_r3806288211), but hopefully we can work around that.

Oh nevermind, maybe `relocateOne()` already handles that case?

https://github.com/llvm/llvm-project/pull/216895