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

[Richard Smith via llvm-commits]

zygoloid wrote:

> @zygoloid I found the existing discussion about why not only Linux in the comments of #152595. Makes sense.
> 
> The problem is that the default of `RequiresNullTerminator` makes all the simple invocations to `getFile`, even if being binaries, fall onto the slow path of not being mmapped

Why? They'd only take the slow path if their size is a multiple of the page size or they hit an OS bug.

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