[llvm] [DA] remove constraint propagation and coupled/separable subscripts (PR #160924)

[Ryotaro Kasuga via llvm-commits]

kasuga-fj wrote:

> I have an admin question first: is this there an issue for this in the bug tracker? I am only asking because we have quite a few DA issues sitting in there now and I was trying to get an overview, and was wondering if this patch addresses one.

If you're referring to GitHub issues, I think the answer is No. There are several *potential* issues in DA that I haven't submitted issues, mainly because I don't have any reproducers. The constraint propagation is one example. While I'm not planning to file such issues in the future either, I can share the potentially problematic parts I've noticed, if that would be helpful.

https://github.com/llvm/llvm-project/pull/160924