[compiler-rt] [compiler-rt][test] Add REQUIRES: shell to focus-function.test with for-loop (PR #106150)

[Paul Kirth via llvm-commits]

ilovepi wrote:

> general nit about these CLs: i think it wouldn't hurt to add a comment next to the `REQUIRES: shell` saying why

That's a fair point. @Harini0924, would you mind addressing that here an in your other PRs?

https://github.com/llvm/llvm-project/pull/106150