[llvm] LCA: migrate from DA to LAA; fix cost computation (PR #107691)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> In my mind, DA = DivergenceAnalysis but I don't see any change to DivergenceAnalysis in this patch. Do you mean DI (DependenceInfo) in the patch title?

DependenceAnalysis. It should be clear from the context, as we're migrating from DependenceAnalysis to LoopAccessAnalysis.

https://github.com/llvm/llvm-project/pull/107691