[llvm] [RISCV] Don't vectorize for loops with small trip count (PR #132176)

[Luke Lau via llvm-commits]

lukel97 wrote:

Do we still want to vectorize small trip counts with EVL tail folding? 

I can also queue up a performance run for this on the BPI-F3 (without tail folding)

https://github.com/llvm/llvm-project/pull/132176