[llvm] [TailDuplicator] Add maximum predecessors and successors to consider tail duplicating blocks (PR #78582)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

LGTM. The new check looks sufficiently narrow (requires many predecessors and many successors) to just do this.

https://github.com/llvm/llvm-project/pull/78582