[libc-commits] [libc] [libc] move __stack_chk_fail to src/ from startup/ (PR #75863)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

I talked with @michaelrj-google about adding a  `EXPECT_DEATH` for this, too.

https://github.com/llvm/llvm-project/pull/75863