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

[Quentin Dian via llvm-commits]

DianQK wrote:

> We started seeing a ~36% regression in the https://github.com/llvm/llvm-test-suite/blob/main/SingleSource/Benchmarks/Misc/evalloop.c benchmark on AArch64. Is this expected?

Could you try with `-tail-dup-pred-size=64 -tail-dup-succ-size=64`? It seems I can't reproduce it on x86-64.

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