[libc] [llvm] [libc] enable stack protectors and frame pointers on default (PR #86288)

[Michael Jones via llvm-commits]

https://github.com/michaelrj-google approved this pull request.

This looks fine for now, though in future it might be best to move this option to config.json so it can be set per platform.

https://github.com/llvm/llvm-project/pull/86288