[libc-commits] [libc] [libc][OSUtil] refactor quick_exit to be an object library everywhere (PR #85955)

[Nick Desaulniers via libc-commits]

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nickdesaulniers wrote:

ah, missing header block. Let me go back and `git mv` the .h to this .cpp file, then strip out the header guards.

https://github.com/llvm/llvm-project/pull/85955