[llvm] [SCEV] Preserve recursion depth when folding zext (PR #202350)

[Nikita Popov via llvm-commits]

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nikic wrote:

This looks like a very fragile test case. At least this should be directly calling the loop-reduce pass without going through llc, but ideall this would not be based on LSR at all -- I don't even know where this creates the relevant pattern that's being matched.

(I'd prefer no test case over a bad test case.)

https://github.com/llvm/llvm-project/pull/202350