[Bug c/88088] -Wtrampolines should be enabled by -Wall (or -Wextra)

[mark at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88088

--- Comment #20 from Mark Wielaard <mark at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2018-11/msg02055.html