[clang] Revert "[Clang][Sema] Fix lookup of dependent operator= outside of complete-class contexts (#91498)" (PR #91620)

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git-clang-format --diff 1494d8849fa2aef575dabd431b0060639f4a57c1 7b2f3da17dfc93a4f0aa69ad4da90707b6f2e8b6 -- clang/lib/Sema/SemaLookup.cpp clang/lib/Sema/SemaTemplate.cpp clang/test/CXX/temp/temp.res/temp.dep/temp.dep.type/p4.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 7e57fa0696..2fce2238f9 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -750,7 +750,8 @@ Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
   if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum &&
       isa<CXXMethodDecl>(DC) &&
       cast<CXXMethodDecl>(DC)->isImplicitObjectMemberFunction()) {
-    QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType().getNonReferenceType();
+    QualType ThisType =
+        cast<CXXMethodDecl>(DC)->getThisType().getNonReferenceType();
 
     // Since the 'this' expression is synthesized, we don't need to
     // perform the double-lookup check.

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https://github.com/llvm/llvm-project/pull/91620