ojhunt wrote:

> I'm confused -- how is there existing code depending on a builtin which 
> doesn't yet exist in Clang? Are we copying these builtins from somewhere else?

This is part of the pointer authentication support we are upstreaming, all of 
which has been in use for a long time, just not available in upstream 
llvm/clang.

https://github.com/llvm/llvm-project/pull/135469
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