[Bug c/79153] -Wimplicit-fallthrough missed warning

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79153

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is probably because although we're handling ifs:
 1896       /* Ifs are tricky.  */
 1897       if (gimple_code (gsi_stmt (*gsi_p)) == GIMPLE_COND)
we're not handling switches like that.  Won't be that easy I'm afraid.