[clang] [llvm] [lit] Implement ulimit builtin (PR #157958)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

Yeah, just got a couple of the emails. I'll revert this for now and take a look locally when I have a chance to get a build setup.

https://github.com/llvm/llvm-project/pull/157958