[llvm] [LV] Handle chained selects/blends when creating new rdx chain. (PR #199443)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

@thurstond thanks for the revert. should be fixed in the recommit: https://github.com/llvm/llvm-project/commit/f6e4e71fcdbff98cb060f87695c75f00b43bf918

It looks like the bot is currently having some infrastructure issues, as the last build seems to be ~20 hours ago

https://github.com/llvm/llvm-project/pull/199443