[llvm] [LV][EVL] Disable fixed-order recurrence idiom with EVL tail folding. (PR #122458)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

The title should probably say `Fixes https://github.com/llvm/llvm-project/issues/122461` to close it on commit.

I'm curious if testing could be improved to catch things like this earlier. As this is part of llvm-test-suite, does this mean that there isn't any automatic runtime testing running llvm-test-suite with EVL mode enabled?

https://github.com/llvm/llvm-project/pull/122458