[Clang][NFC] Remove unnecessary copy (#97902)

Summary:
Reported by Static Analyzer Tool:

In
clang::ASTNodeImporter::VisitCountAttributedType(clang::CountAttributedType
const *): Using the auto keyword without an & causes the copy of an
object of type TypeCoupledDeclRefInfo

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Differential Revision: https://phabricator.intern.facebook.com/D60251598

Author: smanna12

clang/lib/AST/ASTImporter.cpp

@@ -1551,7 +1551,7 @@ ASTNodeImporter::VisitCountAttributedType(const CountAttributedType *T) {
   Expr *CountExpr = importChecked(Err, T->getCountExpr());
 
   SmallVector<TypeCoupledDeclRefInfo, 1> CoupledDecls;
-  for (auto TI : T->dependent_decls()) {
+  for (const TypeCoupledDeclRefInfo &TI : T->dependent_decls()) {
     Expected<ValueDecl *> ToDeclOrErr = import(TI.getDecl());
     if (!ToDeclOrErr)
       return ToDeclOrErr.takeError();