[llvm] [DebugInfo] Add num_extra_inhabitants to debug info (PR #112590)

[Augusto Noronha via llvm-commits]

augusto2112 wrote:

> Oh, do you have a link to the ABI documentation that describes/shows how "num extra inhabitants" would be enough to know which bit patterns are available for extra inhabitants?

There's _some_ documentation at https://github.com/swiftlang/swift/blob/main/docs/ABIStabilityManifesto.md and https://github.com/swiftlang/swift/blob/main/docs/ABI/TypeLayout.rst, although it doesn't seem to be complete, unfortunately.

https://github.com/llvm/llvm-project/pull/112590