[llvm] [Analysis] Visit orphan Functions in GCGPassManager catch-up loop (PR #194219)

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SjoerdNijboer wrote:

> Would it work to somehow take advantage of `scc_iterator`'s internals? I'm thinking in terms of a false-by-default parameter (`includeUnreachableSCCs` or something), which when enabled tells the `scc_iterator` to keep going until there are no more unvisited nodes in the graph (essentially the same thing you have here, but inside the iterator).

I did it slightly different since I didn’t want to impact other passes. But yes, this seems to tidy up the code a lot.

https://github.com/llvm/llvm-project/pull/194219