[Clang][AST][NFC] Introduce `NamespaceBaseDecl` (#149123)

Add `NamespaceBaseDecl` as common base class of `NamespaceDecl` and
`NamespaceAliasDecl`. This simplifies `NestedNameSpecifier` a bit.

Co-authored-by: Matheus Izvekov <mizvekov@gmail.com>

1 files changed, 1 insertions, 14 deletions

diff --git a/clang/lib/Sema/DeclSpec.cpp b/clang/lib/Sema/DeclSpec.cpp
index ee5a862..f0f1d66 100644
--- a/clang/lib/Sema/DeclSpec.cpp
+++ b/clang/lib/Sema/DeclSpec.cpp
@@ -72,7 +72,7 @@ void CXXScopeSpec::Extend(ASTContext &Context, IdentifierInfo *Identifier,
          "NestedNameSpecifierLoc range computation incorrect");
 }
 
-void CXXScopeSpec::Extend(ASTContext &Context, NamespaceDecl *Namespace,
+void CXXScopeSpec::Extend(ASTContext &Context, NamespaceBaseDecl *Namespace,
                           SourceLocation NamespaceLoc,
                           SourceLocation ColonColonLoc) {
   Builder.Extend(Context, Namespace, NamespaceLoc, ColonColonLoc);
@@ -85,19 +85,6 @@ void CXXScopeSpec::Extend(ASTContext &Context, NamespaceDecl *Namespace,
          "NestedNameSpecifierLoc range computation incorrect");
 }
 
-void CXXScopeSpec::Extend(ASTContext &Context, NamespaceAliasDecl *Alias,
-                          SourceLocation AliasLoc,
-                          SourceLocation ColonColonLoc) {
-  Builder.Extend(Context, Alias, AliasLoc, ColonColonLoc);
-
-  if (Range.getBegin().isInvalid())
-    Range.setBegin(AliasLoc);
-  Range.setEnd(ColonColonLoc);
-
-  assert(Range == Builder.getSourceRange() &&
-         "NestedNameSpecifierLoc range computation incorrect");
-}
-
 void CXXScopeSpec::MakeGlobal(ASTContext &Context,
                               SourceLocation ColonColonLoc) {
   Builder.MakeGlobal(Context, ColonColonLoc);