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

[via llvm-commits]

alexfh wrote:

Actually, just `-mllvm=-tail-dup-succ-size=32` (without touching `-tail-dup-pred-size`) is enough to fix the regression, while `-mllvm=-tail-dup-succ-size=24 -mllvm=-tail-dup-succ-size=24` is not. Thus, the optimal value of `-tail-dup-succ-size` for this particular benchmark is somewhere between 24 and 32 (with the default value of `-tail-dup-pred-size` - 16).

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