swift

c0ccdb16 - Change getBaseName to return DeclBaseName instead of Identifier (#9968)

Change getBaseName to return DeclBaseName instead of Identifier (#9968) This changes `getBaseName()` on `DeclName` to return a `DeclBaseName` instead of an `Identifier`. All places that will continue to be expecting an `Identifier` are changed to call `getBaseIdentifier` which will later assert that the `DeclName` is actually backed by an identifier and not a special name. For transitional purposes, a conversion operator from `DeclBaseName` to `Identifier` has been added that will be removed again once migration to DeclBaseName has been completed in other parts of the compiler. Unify approach to printing declaration names Printing a declaration's name using `<<` and `getBaseName()` is be independent of the return type of `getBaseName()` which will change in the future from `Identifier` to `DeclBaseName`