[llvm] [LAA] Fix incorrect dependency classification. (PR #70819)

[Alexandros Lamprineas via llvm-commits]

labrinea wrote:

> Thanks for the update.
> 
> I had a closer look at all uses of the swapped values, and the swapping is only needed for the printing. The other uses all check that they are the same, except for the `IsWrite`.
> 
> But for those all uses expect them in program order, so not swapping them makes sense.
> 
> I added another test in [5d35342](https://github.com/llvm/llvm-project/commit/5d353423c97517ae1dc66506186e265538b0111f) that is a variant of. the current test case that shows how we currently also incorrectly indentify a dependence that prevents forwarding as forward only (the commit also auto-generates the checks and cleans up the value names a bit).
> 
> Could you rebase and check if the test now also gets handled correctly?

Thanks Florian, the new test does get handled correctly as far as I understand.

https://github.com/llvm/llvm-project/pull/70819