[llvm] [TailDuplicator] Add a limit on the size of predecessors (PR #78582)

[David Blaikie via llvm-commits]

dwblaikie wrote:

@aeubanks mind taking a look at this small patch? Is this limit reasonable/consistent with other similar limits, etc? Do we need more data to back up why this particular bound was chosen?

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