[compiler-rt] [llvm-lit] Add REQUIRES: shell in compiler-rt tests that use the `ulimit` command in lit internal shell (PR #105339)

[Paul Kirth via llvm-commits]

ilovepi wrote:

Probably worth updating the title to `[compiler-rt][test] Add REQUIRES: shell in tests that use the ulimit`, since you're not changing anything in `llvm-lit`.

https://github.com/llvm/llvm-project/pull/105339