[llvm] [StackProtector] Clear out stack protector slot (PR #65461)

[Nick Desaulniers via llvm-commits]

nickdesaulniers wrote:

This seems related to:

https://github.com/KSPP/linux/issues/29
https://github.com/llvm/llvm-project/issues/46338

Mind adding links to those in the commit message and PR description?

I would be curious if you could also find historical context as to why GCC does this only for arm targets (IIUC).

https://github.com/llvm/llvm-project/pull/65461