[llvm] [CodeGen] Remove NumVisited limit in TwoAddressInstructionPass (PR #80627)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

I'm skeptical it's a good idea to remove the limit completely.  The reason we have thresholds like this is that it allows us to use simple algorithms that would otherwise be O(n^2) or worse.  Usually what happens is that the code appears to work fine on common benchmarks, but then someone files a bug report saying the compiler times out in specific cases.

https://github.com/llvm/llvm-project/pull/80627