a010f37901
This is the introductory patch for a larger work which intends to solve the long standing C++ issue with losing type sugar when acessing template specializations. The well known example here is specializing a template with `std::string`, but getting diagnostics related to `std::basic_string<char>` instead. This implements a transform which, upon member access, propagates type sugar from the naming context into the accessed entity. It also implements a single use of this transform, resugaring access to TypeDecls. For more details and discussion see: https://discourse.llvm.org/t/rfc-improving-diagnostics-with-template-specialization-resugaring/64294 This is ready for review, although maybe not finished and there is some more stuff that could be done either here or in follow ups. * Its worth exploring if a global resugaring cache is worthwhile, besides the current operational cache. A global cache would be more expensive to index, so there is a tradeoff, and maybe should be used of the whole result of the operation, while keeping the existing cache for sub-results. * It would be ideal if the transform could live in ASTContext instead of Sema. There are a few dependencies that would have to be tackled. * Template arguments deduced for partial specializations. * Some kinds of type adjustments currently require Sema. Differential Revision: https://reviews.llvm.org/D127695
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