[llvm] [LoopInterchange] Improve profitability check for vectorization (PR #133672)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

( I am away from keyboard for 1.5 weeks, can pick this up later, but good thing Michael is looking now too)

https://github.com/llvm/llvm-project/pull/133672