[lld] [lld][MachO]Multi-threaded i/o. Twice as fast linking a large project. (PR #147134)

[David Spickett via llvm-commits]

DavidSpickett wrote:

> Where can I get "stress"?

Sorry I didn't read the whole comment for some reason. `stress` is the Linux utility, on Ubuntu you can do `sudo apt install stress`. I used that to run a bunch of processes to make it more likely to fail.

https://github.com/llvm/llvm-project/pull/147134