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

[Ryotaro Kasuga via llvm-commits]

kasuga-fj wrote:

To be clear: I *am* happy with this direction -- it's an alternative to NewDA that I proposed on Discourse. However, I'm not sure how things should proceed in this case. For example, should we submit a separate RFC to propose removing certain features from DA?


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