- Replace use of std::isalnum/ispunct with StringExtras version to avoid
possibly locale dependent behavior.
- Remove `static` from printChar (do its deduplicated when linking).
- Use range based for loops and structured bindings.
- No need to use `llvm::` for code in llvm namespace.
Refactor of the llvm-tblgen source into:
- a "Basic" library, which contains the bare minimum utilities to build
`llvm-min-tablegen`
- a "Common" library which contains all of the helpers for TableGen
backends. Such helpers can be shared by more than one backend, and even
unit tested (e.g. CodeExpander is, maybe we can add more over time)
Fixes#80647