[llvm] [LV] Use original trip-count as the vector-trip-count if use predicated EVL instructions for tail-folding. (PR #132675)

[Min-Yih Hsu via llvm-commits]

https://github.com/mshockwave commented:

I thought we want to keep canonical IV alive through the entire duration of loop vectorizer. Otherwise I wouldn't choose to add a Pass right after LV to replace canonical IV with EVL IV in #131005 

https://github.com/llvm/llvm-project/pull/132675