This branch refactors rewrite generation for structs and statics to make it easier for main.rs to control exactly which items get rewritten. This is in preparation for adding a filtering option that can disable rewriting for any DefId. In particular, rewriting of structs and fields has been separated from rewriting of function signatures, and static rewriting has been broken up, so that all rewrite::gen_*_rewrites functions work on a single item per call rather than internally iterating over all relevant items.
This branch refactors rewrite generation for structs and statics to make it easier for
main.rsto control exactly which items get rewritten. This is in preparation for adding a filtering option that can disable rewriting for anyDefId. In particular, rewriting of structs and fields has been separated from rewriting of function signatures, and static rewriting has been broken up, so that allrewrite::gen_*_rewritesfunctions work on a single item per call rather than internally iterating over all relevant items.