[clang] [Sema] Reject unqualified lookup of local nested class name (PR #192678)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/test/Sema/unqualified-lookup-local-class.cpp clang/lib/Sema/SemaLookup.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index 21c3e479e..c0fffb77e 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -1374,7 +1374,7 @@ bool Sema::CppLookupName(LookupResult &R, Scope *S) {
           DeclContext *DC = ND->getDeclContext();
 
           if (DC->isRecord()) {
-          // Only restrict when we're in function or block scope
+            // Only restrict when we're in function or block scope
             if (S->getFnParent() && !S->isClassScope()) {
               continue;
             }

``````````

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https://github.com/llvm/llvm-project/pull/192678