[llvm] [LoopVectorize] Improve algorithm for hoisting runtime checks (PR #73515)

[David Sherwood via llvm-commits]

david-arm wrote:

> The test is also failing when I check out the branch for the PR.
> 
> It looks like the branch is based on [d4cec1c](https://github.com/llvm/llvm-project/commit/d4cec1ce7313608670d5a97d7c9fcccad68ac659), which doesn't have the diff check improvements I think, which is probably why it is failing.

OK thanks I'll try rebasing!

https://github.com/llvm/llvm-project/pull/73515