[llvm] [DebugInfo] Add an specification_of attribute to LLVM DebugInfo (PR #115362)

[David Blaikie via llvm-commits]

dwblaikie wrote:

> > Could you add a more complete description/examples of the Swift situation this is used for currently?
> 
> Do you mean in the commit message?

Sure, that would be fine

https://github.com/llvm/llvm-project/pull/115362