compiler: repro for unmerged scopes due to intermediates

Repro of a case where we should ideally merge consecutive scopes, but where intermediate temporaries prevent the scopes from merging.

We'd need to reorder instructions in order to merge these.

ghstack-source-id: 4f05672604eeb547fc6c26ef99db6572843ac646
Pull Request resolved: https://github.com/facebook/react/pull/29197