[llvm] [LoopIdiomVectorize] Recognize and transform minidx pattern (PR #144987)

[Nikita Popov via llvm-commits]

nikic wrote:

@sjoerdmeijer See also some related discussion on https://github.com/llvm/llvm-project/pull/141556. My takeaway from that was that this really needs a GVN improvement first.

https://github.com/llvm/llvm-project/pull/144987