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

[via llvm-commits]

alexfh wrote:

Sure, I'll run the comparison before and after this commit with `-tail-dup-pred-size=64 -tail-dup-succ-size=64`. And yes, this only reproduces on AArch64, but not on any flavor of x86-64 I have access to.

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