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

[Pengcheng Wang via llvm-commits]

https://github.com/wangpc-pp approved this pull request.

This looks great to me but I defer the final approval to @Mel-Chen. :-)

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