[clang][TypePrinter] Replace AppendScope with printNestedNameSpecifier (#168534) 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 https://github.com/llvm/llvm-project/blob/47c1aa4cef638c97b74f3afb7bed60e92bba1f90/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.
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