[lld] [llvm] [lld][MachO] Follow-up to use madvise() for threaded file page-in. (PR #157917)

[Daniel Rodríguez Troitiño via llvm-commits]

drodriguez wrote:

@zygoloid do you remember why you did not limit the solution in 85cd3d98686c47d015dbcc17f1f7d0714b00e172 to just Linux if only that platform was the one exhibiting the bug. It has performance implications, which other platforms might not need to pay if they don't have the same bug.

https://github.com/llvm/llvm-project/pull/157917