[llvm] Deduplication of cyclic PHI nodes (PR #86662)

[Marek Sedláček via llvm-commits]

mark-sed wrote:

> Thanks, so the actual results are these: https://llvm-compile-time-tracker.com/compare.php?from=df5252165524fbcabbd7287a8d923b5139247114&to=167f6301e6477af8a0c0db1ecd5bd3e655949f00&stat=instructions:u

@nikic I can see that the worst score is about +0.7 % and one has improvement by -0.9 %. I would personally think that these are okay results regarding compile time impact, but I have not really worked with these benchmarks and can't quantify them well enough. What is your experienced opinion on this?

https://github.com/llvm/llvm-project/pull/86662