[llvm] Reland "[DebugInfo][DwarfDebug] Separate creation and population of abstract subprogram DIEs" (PR #160786)

[Vladislav Dzhidzhoev via llvm-commits]

dzhidzhoev wrote:

> LGTM; I feel this masks the overall issue identified in the linked issue (i.e. DIE creation is relying on an assumption that's very easy to be false), but we can save that for another day.

Thank you! I've added it to my backlog.

https://github.com/llvm/llvm-project/pull/160786