[clang] [Clang][Sema] Fix regression due to missing ambiguity check before attempting access check. (PR #80730)

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


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 5942868a215ce4dbd927a7f0b06432e1eeaed698 16968712c7caa38c80c6e8ac4db0e318511aaa99 -- clang/include/clang/Sema/Lookup.h clang/test/CXX/class.derived/class.member.lookup/p11.cpp
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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Sema/Lookup.h b/clang/include/clang/Sema/Lookup.h
index d325e394c1..2f2f2607a9 100644
--- a/clang/include/clang/Sema/Lookup.h
+++ b/clang/include/clang/Sema/Lookup.h
@@ -754,7 +754,8 @@ public:
 
 private:
   void diagnoseAccess() {
-    if (!isAmbiguous() && isClassLookup() && getSema().getLangOpts().AccessControl)
+    if (!isAmbiguous() && isClassLookup() &&
+        getSema().getLangOpts().AccessControl)
       getSema().CheckLookupAccess(*this);
   }
 

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https://github.com/llvm/llvm-project/pull/80730