[lld] [lld][macho] Fold functions with the same Dwarf FDE (PR #213778)

[Zhaoxuan Jiang via llvm-commits]

nocchijiang wrote:

I'm not familiar enough with the DWARF side of things to feel confident reviewing this patch in detail, so I'll leave that part to someone with more context there. That said, I fully agree with the motivation - this is definitely worth fixing. In my own testing on one of our production apps, I've seen a lot of outlined sequences reading/writing FP, and I've had to work around this by rejecting candidates with that shape.

https://github.com/llvm/llvm-project/pull/213778