[llvm] [LV] Add initial legality checks for ee loops with stores (PR #145663)

[David Sherwood via llvm-commits]

david-arm wrote:

Hi @huntergr-arm, can you add more detail to the commit message please explaining what the PR is doing and possibly what the next steps are? Just for reference so that once the patch is merged it's obvious in the git commit log.

https://github.com/llvm/llvm-project/pull/145663