[clang] [Clang][Builtin] add __builtin_exit (PR #74803)

[Erich Keane via cfe-commits]

erichkeane wrote:

This comes down to a question of 'why' from me?  Typically we add builtins like this because libc++ need them, or libc/libstdc++ use them.  In this case, I don't see any evidence of anyone really needing it.

While GCC supports it, I don't really see value here?

Also, this is adding for ALL platforms, so this is something that needs to be validated for all platforms as well (as far as runtime testing).

https://github.com/llvm/llvm-project/pull/74803