[clang] [clang] Fix a bug with qualified name lookup into current instantiation (PR #73018)

[Shafik Yaghmour via cfe-commits]

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@@ -482,8 +481,23 @@ ParsedType Sema::getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
         }
       }
     }
-    // If typo correction failed or was not performed, fall through
-    [[fallthrough]];
+    Result.suppressDiagnostics();
+    return nullptr;
+  case LookupResult::NotFoundInCurrentInstantiation: {
+    if (AllowImplicitTypename == ImplicitTypenameContext::Yes) {
+      QualType T;
+      T = Context.getDependentNameType(ElaboratedTypeKeyword::None,
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shafik wrote:

Why not just initialize `T` when we declare it?

https://github.com/llvm/llvm-project/pull/73018