[clang-rename] RecursiveSymbolVisitor - visit namespace aliases and using directives

[imctrading]

Summary

RecursiveSymbolVisitor - used by clang-rename does not visit namespace aliases and using directives. This patch fixes that.
This allows the tool to be used to rename namespaces.

Fixes https://github.com/llvm/llvm-project/issues/57194

[imctrading]

Fix formatting in the test.

[imctrading]

Fix formatting in RecursiveSymbolVisitor.h

[imctrading]

ping

clang/include/clang/Tooling/Refactoring/RecursiveSymbolVisitor.h

for (const DesignatedInitExpr::Designator &D : E->designators()) {
         const FieldDecl *Decl = D.getField();
         if (!visit(Decl, D.getFieldLoc(), D.getFieldLoc()))
           return false;
       }
     }
     return true;
   }
 
+  bool VisitNamespaceAliasDecl(NamespaceAliasDecl *Declaration) {
+    return visit(Declaration->getAliasedNamespace(),
+                 Declaration->getTargetNameLoc(), Declaration->getEndLoc());
+  }
+
+  bool VisitUsingDirectiveDecl(UsingDirectiveDecl *Declaration) {
+    return visit(Declaration->getNominatedNamespace(),
+                 Declaration->getIdentLocation(), Declaration->getEndLoc());
+  }
+
 private:
   const SourceManager &SM;
   const LangOptions &LangOpts;
 
   bool visit(const NamedDecl *ND, SourceLocation BeginLoc,
              SourceLocation EndLoc) {
     return static_cast<T *>(this)->visitSymbolOccurrence(
         ND, SourceRange(BeginLoc, EndLoc));

clang/test/clang-rename/Namespace.cpp

 namespace gcc /* Test 1 */ {  // CHECK: namespace clang /* Test 1 */ {
   int x;
 }
 
 void boo() {
   gcc::x = 42;                // CHECK: clang::x = 42;
 }
 
+namespace gcc_alias = gcc;    // CHECK: namespace gcc_alias = clang;
+using namespace gcc;          // CHECK: using namespace clang;
+
 // Test 1.
 // RUN: clang-rename -offset=10 -new-name=clang %s -- | sed 's,//.*,,' | FileCheck %s
 
 // To find offsets after modifying the file, use:
 //   grep -Ubo 'Foo.*' <file>