[clang] Recognize friend operator != to fix ambiguity with operator== (PR #70217)

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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 cc2fbc648d7babbfa612f4f5eda3160212ef6ca7 26b9570fadf428e2f55efe0f2d9433cf18305239 -- clang/lib/Sema/SemaOverload.cpp clang/test/CXX/over/over.match/over.match.funcs/over.match.oper/p3-2a.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index ce7503162ef3..3b6b47488634 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -960,7 +960,7 @@ static bool shouldAddReversedEqEq(Sema &S, SourceLocation OpLoc,
       if (FunctionsCorrespond(S.Context, EqFD, Op->getAsFunction()))
         return false;
     return true;
-  } 
+  }
   // Otherwise the search scope is the namespace scope of which F is a member.
   DeclContext *EqDC = EqFD->getEnclosingNamespaceContext();
   for (NamedDecl *Op : EqDC->lookup(NotEqOp)) {

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https://github.com/llvm/llvm-project/pull/70217