[clang] [llvm] [RISCV] Add stack clash protection (PR #117612)

[Raphael Moreira Zinsly via llvm-commits]

rzinsly wrote:

> > > @rzinsly do you need someone to commit this?
> > 
> > 
> > Yes, please.
> 
> Please turn off [Keep my email addresses private](https://github.com/settings/emails) setting in your account. Otherwise the commit will be from the github hidden email which we don't use in LLVM. See [LLVM Discourse](https://discourse.llvm.org/t/hidden-emails-on-github-should-we-do-something-about-it) for more information.

Ok, done!

https://github.com/llvm/llvm-project/pull/117612