[Bug c/115496] RFE: new warning to detect suspicious multline string literals

[dmalcolm at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115496

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
gcc's diagnostic-show-locus.cc has lots of examples of such literals (in the
selftests)