[compiler-rt] [compiler-rt] Replace direct calls to pipe with internal_pipe (PR #97186)

[Chris Apple via llvm-commits]

cjappl wrote:

This seems reasonable to me. 

Please:
* Fix the code formatting issue
* Add a test that catches this issue and proves it doesn't happen anymore

I'm going to add one of the original commenters on your issue to this PR.

https://github.com/llvm/llvm-project/pull/97186