[Bug c/104711] Unnecessary -Wshift-negative-value warning

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104711

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
However, -fsanitize=shift (and -fsanitize=undefined) will diagnose such cases.
They are also diagnosed where constant expressions are required.

So they are still caught by the undefined sanitizers. Maybe the documentation
should mention the warning too.