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

[Raphael Moreira Zinsly via llvm-commits]

rzinsly wrote:

@topperc I opened a PR to fix it: https://github.com/llvm/llvm-project/pull/119451
But go ahead and push yours.

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