[alpha.webkit.NoDeleteChecker] Treat a r-value smart pointer return value as no-delete. (#200912)
Skip the checkin g of the destructor of T in ExprWithCleanups /
CXXBindTemporaryExpr when returning a value using r-value reference
since such a construct never invokes delete.
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Co-authored-by: Balazs Benics <benicsbalazs@gmail.com>