[flang-commits] [flang] [flang][Lower] Implement lowering for new expression kind used in explicit-shape-bounds-spec (PR #215403)

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MattPD wrote:

The [initial commit](https://github.com/llvm/llvm-project/commit/b05b5f121ae1d2fcd80504ac7330eb5d7d4bf7d4) says to “fold when possible and lose the RankOneBoundElement object”, while the [follow-up](https://github.com/llvm/llvm-project/commit/3bc7a4ffc0a51217ed16c815397a89b1215a3caa) preserves the stored wrappers for module round-tripping. That history helped during review. For the squash message, would you consider dropping the description’s last paragraph or replacing it with the rationale for the final design?

https://github.com/llvm/llvm-project/pull/215403