[llvm] [mlir] [Dwarf] Support `__ptrauth` qualifier in metadata nodes (PR #83862)

[David Blaikie via llvm-commits]

dwblaikie wrote:

> > What sort of conflicts/breakages are you expecting? I guess API breaks on DIBuilder for custom frontends? Other things to look out for?
> 
> Just regular merge conflicts when we merge this into the Swift fork. This PR is upstreaming ptrauth support and started off based on the downstream code, but after a few iterations of review it looks a bit different. That's totally fine, as the result is better for it, but git will need a hand with the merge. The only reason I'm bringing it up is because last time this PR landed on a Friday afternoon (before it got revert) which left us little to deal with all this.

Ah, your own downstream, fair enough. It looks right enough to me, FWIW :)

https://github.com/llvm/llvm-project/pull/83862