PR c++/90875 - added -Wswitch-outside-range option
* doc/invoke.texi (Wswitch-outside-range): Document. * c.opt (Wswitch-outside-range): Added new option. * c-warn.c (c_do_switch_warnings): Use OPT_Wswitch-outside-range. * c-c++-common/Wswitch-outside-range-1.c: New test. * c-c++-common/Wswitch-outside-range-2.c: New test. * c-c++-common/Wswitch-outside-range-3.c: New test. * c-c++-common/Wswitch-outside-range-4.c: New test. From-SVN: r272559
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