[clang] Allow the no_stack_protector attribute on local variables (PR #173311)

[via cfe-commits]

cooperp wrote:

Thanks for the review @ahatanak.  @AaronBallman I've renamed this to avoid overloading the existing `no_stack_protector`. Do you have any other comments/concerns?

https://github.com/llvm/llvm-project/pull/173311