- Prevent symbols from being stripped so that it can run with 'RelWithDebInfo'.
- Adjust llvm-support CHECKs after code changes.
- Polish mlir-support CHECKs as suggested in https://reviews.llvm.org/D116646.
Differential Revision: https://reviews.llvm.org/D116837
This isn't perfect, since it doesn't use lazy_string - so if the
std::string does contain unprintable characters it might fail, but seems
better than nothing & LLVM doesn't generally store binary data in
std::strings.