[clang] [Sema] Avoid an undesired pack expansion while transforming PackIndexingType (PR #90195)

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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 3ea9ed471c8dca8f703d7f3ce93d274a718b54bb 7a087f06240ce09a64fe679df14380e2fa538701 -- clang/lib/AST/ExprClassification.cpp clang/lib/Sema/TreeTransform.h clang/test/SemaCXX/cxx2c-pack-indexing.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/ExprClassification.cpp b/clang/lib/AST/ExprClassification.cpp
index f943a6ba0d..45e05970df 100644
--- a/clang/lib/AST/ExprClassification.cpp
+++ b/clang/lib/AST/ExprClassification.cpp
@@ -217,7 +217,7 @@ static Cl::Kinds ClassifyInternal(ASTContext &Ctx, const Expr *E) {
                  cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
 
   case Expr::PackIndexingExprClass: {
-    // A pack-index-expression always expand to an id-expression. 
+    // A pack-index-expression always expand to an id-expression.
     // Consider it as an LValue expression.
     if (cast<PackIndexingExpr>(E)->isInstantiationDependent())
       return Cl::CL_LValue;

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https://github.com/llvm/llvm-project/pull/90195