bb1b82af39
In debug-info we soon have the need to print names using the full scope
of the entity (see discussion in
https://github.com/llvm/llvm-project/pull/159592). Particularly, when a
structure is scoped inside a function, we'd like to emit the name as
`func()::foo`. `CGDebugInfo` uses the `TypePrinter` to print type names
into debug-info. However, `TypePrinter` stops (and ignores)
`DeclContext`s that are functions. I.e., it would just print `foo`.
Ideally it would behave the same way `printNestedNameSpecifier` does.
The FIXME in
47c1aa4cef/clang/lib/AST/TypePrinter.cpp (L1520-L1521)
motivated this patch.
See https://github.com/llvm/llvm-project/pull/168533 for how this will
be used by `CGDebugInfo`. The plan is to introduce a new
`PrintingPolicy` that prints anonymous entities using their full scope
(including function/anonymous scopes) and the mangling number.