[llvm] [LV] Change loops' interleave count computation (PR #73766)

[Nilanjana Basu via llvm-commits]

nilanjana87 wrote:

This is a duplicate of the PR in https://github.com/llvm/llvm-project/pull/70141 which got disrupted by a wrong rebasing operation by mistake. 

https://github.com/llvm/llvm-project/pull/73766