[llvm] [LV] Simplify epilogue VF selection by comparing against MaxTripCount (PR #186185)

[Hassnaa Hamdi via llvm-commits]

hassnaaHamdi wrote:

As David advised, I will split the patch into smaller ones to validate/test each changed logic separately.
I have resolved the required changes downstream, I will create new smaller patches with the resolved comments.

https://github.com/llvm/llvm-project/pull/186185