re PR c/81783 (-Wtautological-compare could do better)
PR c/81783 * c-warn.c (warn_tautological_bitwise_comparison): New function. (warn_tautological_cmp): Call it. * doc/invoke.texi: Update -Wtautological-compare documentation. * c-c++-common/Wtautological-compare-5.c: New test. From-SVN: r251660
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